Merge branch 'development' into feature/instant/account-state-change

* development:
  [instant] Viewport specific errors (#1228)
  Added more comments
  Include wholeNumberSchema in sra-spec schemas
  chore(instant): fix linter
  Fix isNode
  fix(instant): update buy quote at start up in the case of default amount
  fix: apply css reset to overlay as well
  fix(website): turn off production flag when building locally
  chore: linter
  fix: progress bar
  fix: use fontSize prop in button
  feat: make instant resistant to external styles
  feat: add faux externall css file
  Add upstream issue
  Use const require instead of import
  Fix tslint issues
  Use detect-node
  Set curstom inspect printer in BigNumber

31 files changed, 473 insertions, 286 deletions

diff --git a/packages/instant/public/external.css b/packages/instant/public/external.css
new file mode 100644
index 000000000..cab11112a
--- /dev/null
+++ b/packages/instant/public/external.css
@@ -0,0 +1,25 @@
+/*
+  CSS file meant to represent an external (integrators) stylesheet and 
+  help ensure that instant looks consistent across environments. 
+*/
+
+button {
+    font-size: 50px;
+    height: 200px;
+    background-color: red;
+}
+
+input {
+    padding: 100px;
+    font-size: 50px;
+    height: 100px;
+}
+
+div {
+    padding: 3px;
+}
+
+p {
+    background-color: green;
+    margin: 10px;
+}
diff --git a/packages/instant/public/index.html b/packages/instant/public/index.html
index 033a125a4..f6c809e33 100644
--- a/packages/instant/public/index.html
+++ b/packages/instant/public/index.html
@@ -5,6 +5,7 @@
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <title>0x Instant Dev Environment</title>
+    <link rel="stylesheet" href="/external.css">
     <script type="text/javascript" src="/main.bundle.js" charset="utf-8"></script>
     <script type="text/javascript" src="https://unpkg.com/jsuri@1.3.1/Uri.js" charset="utf-8"></script>
     <script type="text/javascript" src="https://unpkg.com/bignumber.js@4.1.0/bignumber.js" charset="utf-8"></script>
diff --git a/packages/instant/src/components/animations/position_animation.tsx b/packages/instant/src/components/animations/position_animation.tsx
index 4bb21befb..576d29c07 100644
--- a/packages/instant/src/components/animations/position_animation.tsx
+++ b/packages/instant/src/components/animations/position_animation.tsx
@@ -1,5 +1,6 @@
-import { Keyframes } from 'styled-components';
+import { InterpolationValue } from 'styled-components';
 
+import { media, OptionallyScreenSpecific, stylesForMedia } from '../../style/media';
 import { css, keyframes, styled } from '../../style/theme';
 
 export interface TransitionInfo {
@@ -51,30 +52,57 @@ export interface PositionAnimationSettings {
     right?: TransitionInfo;
     timingFunction: string;
     duration?: string;
+    position?: string;
 }
 
-export interface PositionAnimationProps extends PositionAnimationSettings {
-    position: string;
+const generatePositionAnimationCss = (positionSettings: PositionAnimationSettings) => {
+    return css`
+        animation-name: ${slideKeyframeGenerator(
+            positionSettings.position || 'relative',
+            positionSettings.top,
+            positionSettings.bottom,
+            positionSettings.left,
+            positionSettings.right,
+        )};
+        animation-duration: ${positionSettings.duration || '0.3s'};
+        animation-timing-function: ${positionSettings.timingFunction};
+        animation-delay: 0s;
+        animation-iteration-count: 1;
+        animation-fill-mode: forwards;
+        position: ${positionSettings.position || 'relative'};
+        width: 100%;
+    `;
+};
+
+export interface PositionAnimationProps {
+    positionSettings: OptionallyScreenSpecific<PositionAnimationSettings>;
+    zIndex?: OptionallyScreenSpecific<number>;
 }
 
+const defaultAnimation = (positionSettings: OptionallyScreenSpecific<PositionAnimationSettings>) => {
+    const bestDefault = 'default' in positionSettings ? positionSettings.default : positionSettings;
+    return generatePositionAnimationCss(bestDefault);
+};
+const animationForSize = (
+    positionSettings: OptionallyScreenSpecific<PositionAnimationSettings>,
+    sizeKey: 'sm' | 'md' | 'lg',
+    mediaFn: (...args: any[]) => InterpolationValue[],
+) => {
+    // checking default makes sure we have a PositionAnimationSettings object
+    // and then we check to see if we have a setting for the specific `sizeKey`
+    const animationSettingsForSize = 'default' in positionSettings && positionSettings[sizeKey];
+    return animationSettingsForSize && mediaFn`${generatePositionAnimationCss(animationSettingsForSize)}`;
+};
+
 export const PositionAnimation =
     styled.div <
     PositionAnimationProps >
     `
-    animation-name: ${props =>
-        css`
-            ${slideKeyframeGenerator(props.position, props.top, props.bottom, props.left, props.right)};
-        `};
-    animation-duration: ${props => props.duration || '0.3s'};
-    animation-timing-function: ${props => props.timingFunction};
-    animation-delay: 0s;
-    animation-iteration-count: 1;
-    animation-fill-mode: forwards;
-    position: ${props => props.position};
-    height: 100%;
-    width: 100%;
+    && {
+        ${props => props.zIndex && stylesForMedia<number>('z-index', props.zIndex)}
+        ${props => defaultAnimation(props.positionSettings)}
+        ${props => animationForSize(props.positionSettings, 'sm', media.small)}
+        ${props => animationForSize(props.positionSettings, 'md', media.medium)}
+        ${props => animationForSize(props.positionSettings, 'lg', media.large)}
+    }
 `;
-
-PositionAnimation.defaultProps = {
-    position: 'relative',
-};
diff --git a/packages/instant/src/components/animations/slide_animation.tsx b/packages/instant/src/components/animations/slide_animation.tsx
index 66a314c7f..122229dee 100644
--- a/packages/instant/src/components/animations/slide_animation.tsx
+++ b/packages/instant/src/components/animations/slide_animation.tsx
@@ -1,22 +1,24 @@
 import * as React from 'react';
 
+import { OptionallyScreenSpecific } from '../../style/media';
+
 import { PositionAnimation, PositionAnimationSettings } from './position_animation';
 
 export type SlideAnimationState = 'slidIn' | 'slidOut' | 'none';
 export interface SlideAnimationProps {
-    position: string;
     animationState: SlideAnimationState;
-    slideInSettings: PositionAnimationSettings;
-    slideOutSettings: PositionAnimationSettings;
+    slideInSettings: OptionallyScreenSpecific<PositionAnimationSettings>;
+    slideOutSettings: OptionallyScreenSpecific<PositionAnimationSettings>;
+    zIndex?: OptionallyScreenSpecific<number>;
 }
 
 export const SlideAnimation: React.StatelessComponent<SlideAnimationProps> = props => {
     if (props.animationState === 'none') {
         return <React.Fragment>{props.children}</React.Fragment>;
     }
-    const propsToUse = props.animationState === 'slidIn' ? props.slideInSettings : props.slideOutSettings;
+    const positionSettings = props.animationState === 'slidIn' ? props.slideInSettings : props.slideOutSettings;
     return (
-        <PositionAnimation position={props.position} {...propsToUse}>
+        <PositionAnimation positionSettings={positionSettings} zIndex={props.zIndex}>
             {props.children}
         </PositionAnimation>
     );
diff --git a/packages/instant/src/components/buy_button.tsx b/packages/instant/src/components/buy_button.tsx
index 9a6e22ea9..877ab275c 100644
--- a/packages/instant/src/components/buy_button.tsx
+++ b/packages/instant/src/components/buy_button.tsx
@@ -12,7 +12,6 @@ import { gasPriceEstimator } from '../util/gas_price_estimator';
 import { util } from '../util/util';
 
 import { Button } from './ui/button';
-import { Text } from './ui/text';
 
 export interface BuyButtonProps {
     accountAddress?: string;
@@ -39,10 +38,14 @@ export class BuyButton extends React.Component<BuyButtonProps> {
         const { buyQuote, accountAddress } = this.props;
         const shouldDisableButton = _.isUndefined(buyQuote) || _.isUndefined(accountAddress);
         return (
-            <Button width="100%" onClick={this._handleClick} isDisabled={shouldDisableButton}>
-                <Text fontColor={ColorOption.white} fontWeight={600} fontSize="20px">
-                    Buy
-                </Text>
+            <Button
+                width="100%"
+                onClick={this._handleClick}
+                isDisabled={shouldDisableButton}
+                fontColor={ColorOption.white}
+                fontSize="20px"
+            >
+                Buy
             </Button>
         );
     }
diff --git a/packages/instant/src/components/buy_order_state_buttons.tsx b/packages/instant/src/components/buy_order_state_buttons.tsx
index b46ff7714..6041bf4f5 100644
--- a/packages/instant/src/components/buy_order_state_buttons.tsx
+++ b/packages/instant/src/components/buy_order_state_buttons.tsx
@@ -12,7 +12,6 @@ import { SecondaryButton } from './secondary_button';
 
 import { Button } from './ui/button';
 import { Flex } from './ui/flex';
-import { Text } from './ui/text';
 
 export interface BuyOrderStateButtonProps {
     accountAddress?: string;
@@ -36,10 +35,8 @@ export const BuyOrderStateButtons: React.StatelessComponent<BuyOrderStateButtonP
     if (props.buyOrderProcessingState === OrderProcessState.Failure) {
         return (
             <Flex justify="space-between">
-                <Button width="48%" onClick={props.onRetry}>
-                    <Text fontColor={ColorOption.white} fontWeight={600} fontSize="16px">
-                        Back
-                    </Text>
+                <Button width="48%" onClick={props.onRetry} fontColor={ColorOption.white} fontSize="16px">
+                    Back
                 </Button>
                 <SecondaryButton width="48%" onClick={props.onViewTransaction}>
                     Details
diff --git a/packages/instant/src/components/css_reset.tsx b/packages/instant/src/components/css_reset.tsx
new file mode 100644
index 000000000..a1dd2e05c
--- /dev/null
+++ b/packages/instant/src/components/css_reset.tsx
@@ -0,0 +1,33 @@
+import { INJECTED_DIV_CLASS } from '../constants';
+import { createGlobalStyle } from '../style/theme';
+
+export interface CSSResetProps {}
+
+/*
+* Derived from
+* https://github.com/jtrost/Complete-CSS-Reset
+*/
+export const CSSReset = createGlobalStyle`
+    .${INJECTED_DIV_CLASS} {
+        a, abbr, area, article, aside, audio, b, bdo, blockquote, body, button,
+        canvas, caption, cite, code, col, colgroup, command, datalist, dd, del,
+        details, dialog, dfn, div, dl, dt, em, embed, fieldset, figure, form,
+        h1, h2, h3, h4, h5, h6, head, header, hgroup, hr, html, i, iframe, img,
+        input, ins, keygen, kbd, label, legend, li, map, mark, menu, meter, nav,
+        noscript, object, ol, optgroup, option, output, p, param, pre, progress,
+        q, rp, rt, ruby, samp, section, select, small, span, strong, sub, sup,
+        table, tbody, td, textarea, tfoot, th, thead, time, tr, ul, var, video {
+            background: transparent;
+            border: 0;
+            font-size: 100%;
+            font: inherit;
+            margin: 0;
+            outline: none;
+            padding: 0;
+            text-align: left;
+            text-decoration: none;
+            vertical-align: baseline;
+            z-index: 1;
+        }
+    }
+`;
diff --git a/packages/instant/src/components/placing_order_button.tsx b/packages/instant/src/components/placing_order_button.tsx
index 4232e6c22..d774d7d27 100644
--- a/packages/instant/src/components/placing_order_button.tsx
+++ b/packages/instant/src/components/placing_order_button.tsx
@@ -5,15 +5,12 @@ import { ColorOption } from '../style/theme';
 import { Button } from './ui/button';
 import { Container } from './ui/container';
 import { Spinner } from './ui/spinner';
-import { Text } from './ui/text';
 
 export const PlacingOrderButton: React.StatelessComponent<{}> = props => (
-    <Button isDisabled={true} width="100%">
+    <Button isDisabled={true} width="100%" fontColor={ColorOption.white} fontSize="20px">
         <Container display="inline-block" position="relative" top="3px" marginRight="8px">
             <Spinner widthPx={20} heightPx={20} />
         </Container>
-        <Text fontColor={ColorOption.white} fontWeight={600} fontSize="20px">
-            Placing Order&hellip;
-        </Text>
+        Placing Order&hellip;
     </Button>
 );
diff --git a/packages/instant/src/components/secondary_button.tsx b/packages/instant/src/components/secondary_button.tsx
index 583058b5b..df0539606 100644
--- a/packages/instant/src/components/secondary_button.tsx
+++ b/packages/instant/src/components/secondary_button.tsx
@@ -4,7 +4,6 @@ import * as React from 'react';
 import { ColorOption } from '../style/theme';
 
 import { Button, ButtonProps } from './ui/button';
-import { Text } from './ui/text';
 
 export interface SecondaryButtonProps extends ButtonProps {}
 
@@ -16,11 +15,11 @@ export const SecondaryButton: React.StatelessComponent<SecondaryButtonProps> = p
             borderColor={ColorOption.lightGrey}
             width={props.width}
             onClick={props.onClick}
+            fontColor={ColorOption.primaryColor}
+            fontSize="16px"
             {...buttonProps}
         >
-            <Text fontColor={ColorOption.primaryColor} fontWeight={600} fontSize="16px">
-                {props.children}
-            </Text>
+            {props.children}
         </Button>
     );
 };
diff --git a/packages/instant/src/components/sliding_error.tsx b/packages/instant/src/components/sliding_error.tsx
index a923b9932..462199d78 100644
--- a/packages/instant/src/components/sliding_error.tsx
+++ b/packages/instant/src/components/sliding_error.tsx
@@ -1,6 +1,8 @@
 import * as React from 'react';
 
+import { ScreenSpecification } from '../style/media';
 import { ColorOption } from '../style/theme';
+import { zIndex } from '../style/z_index';
 
 import { PositionAnimationSettings } from './animations/position_animation';
 import { SlideAnimation, SlideAnimationState } from './animations/slide_animation';
@@ -21,6 +23,7 @@ export const Error: React.StatelessComponent<ErrorProps> = props => (
         backgroundColor={ColorOption.lightOrange}
         width="100%"
         borderRadius="6px"
+        marginTop="10px"
         marginBottom="10px"
     >
         <Flex justify="flex-start">
@@ -39,25 +42,51 @@ export interface SlidingErrorProps extends ErrorProps {
 }
 export const SlidingError: React.StatelessComponent<SlidingErrorProps> = props => {
     const slideAmount = '120px';
-    const slideUpSettings: PositionAnimationSettings = {
+
+    const desktopSlideIn: PositionAnimationSettings = {
         timingFunction: 'ease-in',
         top: {
             from: slideAmount,
             to: '0px',
         },
+        position: 'relative',
     };
-    const slideDownSettings: PositionAnimationSettings = {
+    const desktopSlideOut: PositionAnimationSettings = {
         timingFunction: 'cubic-bezier(0.25, 0.1, 0.25, 1)',
         top: {
             from: '0px',
             to: slideAmount,
         },
+        position: 'relative',
+    };
+
+    const mobileSlideIn: PositionAnimationSettings = {
+        duration: '0.5s',
+        timingFunction: 'ease-in',
+        top: { from: '-120px', to: '0px' },
+        position: 'fixed',
+    };
+    const moblieSlideOut: PositionAnimationSettings = {
+        duration: '0.5s',
+        timingFunction: 'ease-in',
+        top: { from: '0px', to: '-120px' },
+        position: 'fixed',
+    };
+
+    const slideUpSettings: ScreenSpecification<PositionAnimationSettings> = {
+        default: desktopSlideIn,
+        sm: mobileSlideIn,
     };
+    const slideOutSettings: ScreenSpecification<PositionAnimationSettings> = {
+        default: desktopSlideOut,
+        sm: moblieSlideOut,
+    };
+
     return (
         <SlideAnimation
-            position="relative"
             slideInSettings={slideUpSettings}
-            slideOutSettings={slideDownSettings}
+            slideOutSettings={slideOutSettings}
+            zIndex={{ sm: zIndex.errorPopUp, default: zIndex.errorPopBehind }}
             animationState={props.animationState}
         >
             <Error icon={props.icon} message={props.message} />
diff --git a/packages/instant/src/components/sliding_panel.tsx b/packages/instant/src/components/sliding_panel.tsx
index 7ef28e09c..a5d15c401 100644
--- a/packages/instant/src/components/sliding_panel.tsx
+++ b/packages/instant/src/components/sliding_panel.tsx
@@ -51,6 +51,7 @@ export const SlidingPanel: React.StatelessComponent<SlidingPanelProps> = props =
             from: slideAmount,
             to: '0px',
         },
+        position: 'absolute',
     };
     const slideDownSettings: PositionAnimationSettings = {
         duration: '0.3s',
@@ -59,10 +60,10 @@ export const SlidingPanel: React.StatelessComponent<SlidingPanelProps> = props =
             from: '0px',
             to: slideAmount,
         },
+        position: 'absolute',
     };
     return (
         <SlideAnimation
-            position="absolute"
             slideInSettings={slideUpSettings}
             slideOutSettings={slideDownSettings}
             animationState={animationState}
diff --git a/packages/instant/src/components/timed_progress_bar.tsx b/packages/instant/src/components/timed_progress_bar.tsx
index f2a6f5745..59aaa33a1 100644
--- a/packages/instant/src/components/timed_progress_bar.tsx
+++ b/packages/instant/src/components/timed_progress_bar.tsx
@@ -70,9 +70,11 @@ export const TimedProgress =
     styled.div <
     TimedProgressProps >
     `
-    background-color: ${props => props.theme[ColorOption.primaryColor]};
-    border-radius: 6px;
-    height: 6px;
-    animation: ${props => expandingWidthKeyframes(props.fromWidth, props.toWidth)}
-      ${props => props.timeMs}ms linear 1 forwards;
-  `;
+    && {
+        background-color: ${props => props.theme[ColorOption.primaryColor]};
+        border-radius: 6px;
+        height: 6px;
+        animation: ${props => expandingWidthKeyframes(props.fromWidth, props.toWidth)}
+          ${props => props.timeMs}ms linear 1 forwards;
+    }
+`;
diff --git a/packages/instant/src/components/ui/button.tsx b/packages/instant/src/components/ui/button.tsx
index 5274d835b..b90221bf4 100644
--- a/packages/instant/src/components/ui/button.tsx
+++ b/packages/instant/src/components/ui/button.tsx
@@ -6,6 +6,8 @@ import { ColorOption, styled } from '../../style/theme';
 export interface ButtonProps {
     backgroundColor?: ColorOption;
     borderColor?: ColorOption;
+    fontColor?: ColorOption;
+    fontSize?: string;
     width?: string;
     padding?: string;
     type?: string;
@@ -24,29 +26,39 @@ const darkenOnHoverAmount = 0.1;
 const darkenOnActiveAmount = 0.2;
 const saturateOnFocusAmount = 0.2;
 export const Button = styled(PlainButton)`
-    cursor: ${props => (props.isDisabled ? 'default' : 'pointer')};
-    transition: background-color, opacity 0.5s ease;
-    padding: ${props => props.padding};
-    border-radius: 3px;
-    outline: none;
-    width: ${props => props.width};
-    background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
-    border: ${props => (props.borderColor ? `1px solid ${props.theme[props.borderColor]}` : 'none')};
-    &:hover {
-        background-color: ${props =>
-            !props.isDisabled
-                ? darken(darkenOnHoverAmount, props.theme[props.backgroundColor || 'white'])
-                : ''} !important;
-    }
-    &:active {
-        background-color: ${props =>
-            !props.isDisabled ? darken(darkenOnActiveAmount, props.theme[props.backgroundColor || 'white']) : ''};
-    }
-    &:disabled {
-        opacity: 0.5;
-    }
-    &:focus {
-        background-color: ${props => saturate(saturateOnFocusAmount, props.theme[props.backgroundColor || 'white'])};
+    && {
+        all: initial;
+        box-sizing: border-box;
+        font-size: ${props => props.fontSize};
+        font-family: 'Inter UI', sans-serif;
+        font-weight: 600;
+        color: ${props => props.fontColor && props.theme[props.fontColor]};
+        cursor: ${props => (props.isDisabled ? 'default' : 'pointer')};
+        transition: background-color, opacity 0.5s ease;
+        padding: ${props => props.padding};
+        border-radius: 3px;
+        text-align: center;
+        outline: none;
+        width: ${props => props.width};
+        background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
+        border: ${props => (props.borderColor ? `1px solid ${props.theme[props.borderColor]}` : 'none')};
+        &:hover {
+            background-color: ${props =>
+                !props.isDisabled
+                    ? darken(darkenOnHoverAmount, props.theme[props.backgroundColor || 'white'])
+                    : ''} !important;
+        }
+        &:active {
+            background-color: ${props =>
+                !props.isDisabled ? darken(darkenOnActiveAmount, props.theme[props.backgroundColor || 'white']) : ''};
+        }
+        &:disabled {
+            opacity: 0.5;
+        }
+        &:focus {
+            background-color: ${props =>
+                saturate(saturateOnFocusAmount, props.theme[props.backgroundColor || 'white'])};
+        }
     }
 `;
 
@@ -55,7 +67,8 @@ Button.defaultProps = {
     borderColor: ColorOption.primaryColor,
     width: 'auto',
     isDisabled: false,
-    padding: '1em 2.2em',
+    padding: '.6em 1.2em',
+    fontSize: '15px',
 };
 
 Button.displayName = 'Button';
diff --git a/packages/instant/src/components/ui/circle.tsx b/packages/instant/src/components/ui/circle.tsx
index eec2777d2..26764ec71 100644
--- a/packages/instant/src/components/ui/circle.tsx
+++ b/packages/instant/src/components/ui/circle.tsx
@@ -9,10 +9,12 @@ export const Circle =
     styled.div <
     CircleProps >
     `
-    width: ${props => props.diameter}px;
-    height: ${props => props.diameter}px;
-    background-color: ${props => props.fillColor};
-    border-radius: 50%;
+    && {
+        width: ${props => props.diameter}px;
+        height: ${props => props.diameter}px;
+        background-color: ${props => props.fillColor};
+        border-radius: 50%;
+    }
 `;
 
 Circle.displayName = 'Circle';
diff --git a/packages/instant/src/components/ui/container.tsx b/packages/instant/src/components/ui/container.tsx
index 403751210..c42082ed5 100644
--- a/packages/instant/src/components/ui/container.tsx
+++ b/packages/instant/src/components/ui/container.tsx
@@ -41,42 +41,45 @@ export const Container =
     styled.div <
     ContainerProps >
     `
-    box-sizing: border-box;
-    ${props => cssRuleIfExists(props, 'flex-grow')}
-    ${props => cssRuleIfExists(props, 'position')}
-    ${props => cssRuleIfExists(props, 'top')}
-    ${props => cssRuleIfExists(props, 'right')}
-    ${props => cssRuleIfExists(props, 'bottom')}
-    ${props => cssRuleIfExists(props, 'left')}
-    ${props => cssRuleIfExists(props, 'max-width')}
-    ${props => cssRuleIfExists(props, 'margin')}
-    ${props => cssRuleIfExists(props, 'margin-top')}
-    ${props => cssRuleIfExists(props, 'margin-right')}
-    ${props => cssRuleIfExists(props, 'margin-bottom')}
-    ${props => cssRuleIfExists(props, 'margin-left')}
-    ${props => cssRuleIfExists(props, 'padding')}
-    ${props => cssRuleIfExists(props, 'border-radius')}
-    ${props => cssRuleIfExists(props, 'border')}
-    ${props => cssRuleIfExists(props, 'border-top')}
-    ${props => cssRuleIfExists(props, 'border-bottom')}
-    ${props => cssRuleIfExists(props, 'z-index')}
-    ${props => cssRuleIfExists(props, 'white-space')}
-    ${props => cssRuleIfExists(props, 'opacity')}
-    ${props => cssRuleIfExists(props, 'cursor')}
-    ${props => cssRuleIfExists(props, 'overflow')}
-    ${props => (props.hasBoxShadow ? `box-shadow: 0px 2px 10px rgba(0, 0, 0, 0.1)` : '')};
-    ${props => props.display && stylesForMedia('display', props.display)}
-    ${props => stylesForMedia('width', props.width || 'auto')}
-    ${props => stylesForMedia('height', props.height || 'auto')}
-    background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
-    border-color: ${props => (props.borderColor ? props.theme[props.borderColor] : 'none')};
-    &:hover {
-        ${props =>
-            props.darkenOnHover
-                ? `background-color: ${
-                      props.backgroundColor ? darken(0.05, props.theme[props.backgroundColor]) : 'none'
-                  }`
-                : ''};
+    && {
+        all: initial;
+        box-sizing: border-box;
+        ${props => cssRuleIfExists(props, 'flex-grow')}
+        ${props => cssRuleIfExists(props, 'position')}
+        ${props => cssRuleIfExists(props, 'top')}
+        ${props => cssRuleIfExists(props, 'right')}
+        ${props => cssRuleIfExists(props, 'bottom')}
+        ${props => cssRuleIfExists(props, 'left')}
+        ${props => cssRuleIfExists(props, 'max-width')}
+        ${props => cssRuleIfExists(props, 'margin')}
+        ${props => cssRuleIfExists(props, 'margin-top')}
+        ${props => cssRuleIfExists(props, 'margin-right')}
+        ${props => cssRuleIfExists(props, 'margin-bottom')}
+        ${props => cssRuleIfExists(props, 'margin-left')}
+        ${props => cssRuleIfExists(props, 'padding')}
+        ${props => cssRuleIfExists(props, 'border-radius')}
+        ${props => cssRuleIfExists(props, 'border')}
+        ${props => cssRuleIfExists(props, 'border-top')}
+        ${props => cssRuleIfExists(props, 'border-bottom')}
+        ${props => cssRuleIfExists(props, 'z-index')}
+        ${props => cssRuleIfExists(props, 'white-space')}
+        ${props => cssRuleIfExists(props, 'opacity')}
+        ${props => cssRuleIfExists(props, 'cursor')}
+        ${props => cssRuleIfExists(props, 'overflow')}
+        ${props => (props.hasBoxShadow ? `box-shadow: 0px 2px 10px rgba(0, 0, 0, 0.1)` : '')};
+        ${props => props.display && stylesForMedia<string>('display', props.display)}
+        ${props => props.width && stylesForMedia<string>('width', props.width)}
+        ${props => props.height && stylesForMedia<string>('height', props.height)}
+        background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
+        border-color: ${props => (props.borderColor ? props.theme[props.borderColor] : 'none')};
+        &:hover {
+            ${props =>
+                props.darkenOnHover
+                    ? `background-color: ${
+                          props.backgroundColor ? darken(0.05, props.theme[props.backgroundColor]) : 'none'
+                      }`
+                    : ''};
+        }
     }
 `;
 
diff --git a/packages/instant/src/components/ui/flex.tsx b/packages/instant/src/components/ui/flex.tsx
index fd218b0cd..5b00138b8 100644
--- a/packages/instant/src/components/ui/flex.tsx
+++ b/packages/instant/src/components/ui/flex.tsx
@@ -18,15 +18,18 @@ export const Flex =
     styled.div <
     FlexProps >
     `
-    display: ${props => (props.inline ? 'inline-flex' : 'flex')};
-    flex-direction: ${props => props.direction};
-    flex-wrap: ${props => props.flexWrap};
-    ${props => cssRuleIfExists(props, 'flexGrow')}
-    justify-content: ${props => props.justify};
-    align-items: ${props => props.align};
-    background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
-    ${props => stylesForMedia('width', props.width || 'auto')}
-    ${props => stylesForMedia('height', props.height || 'auto')}
+    && {
+        all: initial;
+        display: ${props => (props.inline ? 'inline-flex' : 'flex')};
+        flex-direction: ${props => props.direction};
+        flex-wrap: ${props => props.flexWrap};
+        ${props => cssRuleIfExists(props, 'flexGrow')}
+        justify-content: ${props => props.justify};
+        align-items: ${props => props.align};
+        background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
+        ${props => (props.width ? stylesForMedia('width', props.width) : '')}
+        ${props => (props.height ? stylesForMedia('height', props.height) : '')}
+    }
 `;
 
 Flex.defaultProps = {
diff --git a/packages/instant/src/components/ui/icon.tsx b/packages/instant/src/components/ui/icon.tsx
index 94ea26900..2679dad1a 100644
--- a/packages/instant/src/components/ui/icon.tsx
+++ b/packages/instant/src/components/ui/icon.tsx
@@ -101,15 +101,17 @@ const PlainIcon: React.StatelessComponent<IconProps> = props => {
 };
 
 export const Icon = withTheme(styled(PlainIcon)`
-    cursor: ${props => (!_.isUndefined(props.onClick) ? 'pointer' : 'default')};
-    transition: opacity 0.5s ease;
-    padding: ${props => props.padding};
-    opacity: ${props => (!_.isUndefined(props.onClick) ? 0.7 : 1)};
-    &:hover {
-        opacity: 1;
-    }
-    &:active {
-        opacity: 1;
+    && {
+        cursor: ${props => (!_.isUndefined(props.onClick) ? 'pointer' : 'default')};
+        transition: opacity 0.5s ease;
+        padding: ${props => props.padding};
+        opacity: ${props => (!_.isUndefined(props.onClick) ? 0.7 : 1)};
+        &:hover {
+            opacity: 1;
+        }
+        &:active {
+            opacity: 1;
+        }
     }
 `);
 
diff --git a/packages/instant/src/components/ui/input.tsx b/packages/instant/src/components/ui/input.tsx
index a884ff7cb..2fb408db4 100644
--- a/packages/instant/src/components/ui/input.tsx
+++ b/packages/instant/src/components/ui/input.tsx
@@ -16,17 +16,20 @@ export const Input =
     styled.input <
     InputProps >
     `
-    font-size: ${props => props.fontSize};
-    width: ${props => props.width};
-    padding: 0.1em 0em;
-    font-family: 'Inter UI';
-    color: ${props => props.theme[props.fontColor || 'white']};
-    background: transparent;
-    outline: none;
-    border: none;
-    &::placeholder {
+    && {
+        all: initial;
+        font-size: ${props => props.fontSize};
+        width: ${props => props.width};
+        padding: 0.1em 0em;
+        font-family: 'Inter UI';
         color: ${props => props.theme[props.fontColor || 'white']};
-        opacity: 0.5;
+        background: transparent;
+        outline: none;
+        border: none;
+        &::placeholder {
+            color: ${props => props.theme[props.fontColor || 'white']};
+            opacity: 0.5;
+        }
     }
 `;
 
diff --git a/packages/instant/src/components/ui/overlay.tsx b/packages/instant/src/components/ui/overlay.tsx
index 7110ee70f..8c9572615 100644
--- a/packages/instant/src/components/ui/overlay.tsx
+++ b/packages/instant/src/components/ui/overlay.tsx
@@ -24,13 +24,15 @@ const PlainOverlay: React.StatelessComponent<OverlayProps> = ({ children, classN
     </Flex>
 );
 export const Overlay = styled(PlainOverlay)`
-    position: fixed;
-    top: 0;
-    right: 0;
-    bottom: 0;
-    left: 0;
-    z-index: ${props => props.zIndex}
-    background-color: ${overlayBlack};
+    && {
+        position: fixed;
+        top: 0;
+        right: 0;
+        bottom: 0;
+        left: 0;
+        z-index: ${props => props.zIndex}
+        background-color: ${overlayBlack};
+    }
 `;
 
 Overlay.defaultProps = {
diff --git a/packages/instant/src/components/ui/text.tsx b/packages/instant/src/components/ui/text.tsx
index cba6e7b20..c6a76ff18 100644
--- a/packages/instant/src/components/ui/text.tsx
+++ b/packages/instant/src/components/ui/text.tsx
@@ -27,25 +27,28 @@ export const Text =
     styled.div <
     TextProps >
     `
-    font-family: ${props => props.fontFamily};
-    font-style: ${props => props.fontStyle};
-    font-weight: ${props => props.fontWeight};
-    font-size: ${props => props.fontSize};
-    opacity: ${props => props.opacity};
-    text-decoration-line: ${props => props.textDecorationLine};
-    ${props => (props.lineHeight ? `line-height: ${props.lineHeight}` : '')};
-    ${props => (props.center ? 'text-align: center' : '')};
-    color: ${props => props.fontColor && props.theme[props.fontColor]};
-    ${props => (props.minHeight ? `min-height: ${props.minHeight}` : '')};
-    ${props => (props.onClick ? 'cursor: pointer' : '')};
-    transition: color 0.5s ease;
-    ${props => (props.noWrap ? 'white-space: nowrap' : '')};
-    ${props => (props.display ? `display: ${props.display}` : '')};
-    ${props => (props.letterSpacing ? `letter-spacing: ${props.letterSpacing}` : '')};
-    ${props => (props.textTransform ? `text-transform: ${props.textTransform}` : '')};
-    &:hover {
-        ${props =>
-            props.onClick ? `color: ${darken(darkenOnHoverAmount, props.theme[props.fontColor || 'white'])}` : ''};
+    && {
+        all: initial;
+        font-family: 'Inter UI', sans-serif;
+        font-style: ${props => props.fontStyle};
+        font-weight: ${props => props.fontWeight};
+        font-size: ${props => props.fontSize};
+        opacity: ${props => props.opacity};
+        text-decoration-line: ${props => props.textDecorationLine};
+        ${props => (props.lineHeight ? `line-height: ${props.lineHeight}` : '')};
+        ${props => (props.center ? 'text-align: center' : '')};
+        color: ${props => props.fontColor && props.theme[props.fontColor]};
+        ${props => (props.minHeight ? `min-height: ${props.minHeight}` : '')};
+        ${props => (props.onClick ? 'cursor: pointer' : '')};
+        transition: color 0.5s ease;
+        ${props => (props.noWrap ? 'white-space: nowrap' : '')};
+        ${props => (props.display ? `display: ${props.display}` : '')};
+        ${props => (props.letterSpacing ? `letter-spacing: ${props.letterSpacing}` : '')};
+        ${props => (props.textTransform ? `text-transform: ${props.textTransform}` : '')};
+        &:hover {
+            ${props =>
+                props.onClick ? `color: ${darken(darkenOnHoverAmount, props.theme[props.fontColor || 'white'])}` : ''};
+        }
     }
 `;
 
@@ -61,14 +64,3 @@ Text.defaultProps = {
 };
 
 Text.displayName = 'Text';
-
-export const Title: React.StatelessComponent<TextProps> = props => <Text {...props} />;
-
-Title.defaultProps = {
-    fontSize: '20px',
-    fontWeight: 600,
-    opacity: 1,
-    fontColor: ColorOption.primaryColor,
-};
-
-Title.displayName = 'Title';
diff --git a/packages/instant/src/components/zero_ex_instant.tsx b/packages/instant/src/components/zero_ex_instant.tsx
index 907c42e7a..b945f9908 100644
--- a/packages/instant/src/components/zero_ex_instant.tsx
+++ b/packages/instant/src/components/zero_ex_instant.tsx
@@ -1,5 +1,7 @@
 import * as React from 'react';
 
+import { INJECTED_DIV_CLASS } from '../constants';
+
 import { ZeroExInstantContainer } from './zero_ex_instant_container';
 import { ZeroExInstantProvider, ZeroExInstantProviderProps } from './zero_ex_instant_provider';
 
@@ -7,8 +9,10 @@ export type ZeroExInstantProps = ZeroExInstantProviderProps;
 
 export const ZeroExInstant: React.StatelessComponent<ZeroExInstantProps> = props => {
     return (
-        <ZeroExInstantProvider {...props}>
-            <ZeroExInstantContainer />
-        </ZeroExInstantProvider>
+        <div className={INJECTED_DIV_CLASS}>
+            <ZeroExInstantProvider {...props}>
+                <ZeroExInstantContainer />
+            </ZeroExInstantProvider>
+        </div>
     );
 };
diff --git a/packages/instant/src/components/zero_ex_instant_container.tsx b/packages/instant/src/components/zero_ex_instant_container.tsx
index ef6adf384..d2216b54f 100644
--- a/packages/instant/src/components/zero_ex_instant_container.tsx
+++ b/packages/instant/src/components/zero_ex_instant_container.tsx
@@ -12,6 +12,7 @@ import { ColorOption } from '../style/theme';
 import { zIndex } from '../style/z_index';
 
 import { SlideAnimationState } from './animations/slide_animation';
+import { CSSReset } from './css_reset';
 import { SlidingPanel } from './sliding_panel';
 import { Container } from './ui/container';
 import { Flex } from './ui/flex';
@@ -27,40 +28,43 @@ export class ZeroExInstantContainer extends React.Component<ZeroExInstantContain
     };
     public render(): React.ReactNode {
         return (
-            <Container
-                width={{ default: '350px', sm: '100%' }}
-                height={{ default: 'auto', sm: '100%' }}
-                position="relative"
-            >
-                <Container zIndex={zIndex.errorPopup} position="relative">
-                    <LatestError />
-                </Container>
+            <React.Fragment>
+                <CSSReset />
                 <Container
-                    zIndex={zIndex.mainContainer}
+                    width={{ default: '350px', sm: '100%' }}
+                    height={{ default: 'auto', sm: '100%' }}
                     position="relative"
-                    backgroundColor={ColorOption.white}
-                    borderRadius="3px"
-                    hasBoxShadow={true}
-                    overflow="hidden"
-                    height="100%"
                 >
-                    <Flex direction="column" height="100%" justify="flex-start">
-                        <SelectedAssetInstantHeading onSelectAssetClick={this._handleSymbolClick} />
-                        <SelectedAssetBuyOrderProgress />
-                        <LatestBuyQuoteOrderDetails />
-                        <Container padding="20px" width="100%">
-                            <SelectedAssetBuyOrderStateButtons />
-                        </Container>
-                    </Flex>
-                    <SlidingPanel
-                        title="Select Token"
-                        animationState={this.state.tokenSelectionPanelAnimationState}
-                        onClose={this._handlePanelClose}
+                    <Container position="relative">
+                        <LatestError />
+                    </Container>
+                    <Container
+                        zIndex={zIndex.mainContainer}
+                        position="relative"
+                        backgroundColor={ColorOption.white}
+                        borderRadius="3px"
+                        hasBoxShadow={true}
+                        overflow="hidden"
+                        height="100%"
                     >
-                        <AvailableERC20TokenSelector onTokenSelect={this._handlePanelClose} />
-                    </SlidingPanel>
+                        <Flex direction="column" justify="flex-start" height="100%">
+                            <SelectedAssetInstantHeading onSelectAssetClick={this._handleSymbolClick} />
+                            <SelectedAssetBuyOrderProgress />
+                            <LatestBuyQuoteOrderDetails />
+                            <Container padding="20px" width="100%">
+                                <SelectedAssetBuyOrderStateButtons />
+                            </Container>
+                        </Flex>
+                        <SlidingPanel
+                            title="Select Token"
+                            animationState={this.state.tokenSelectionPanelAnimationState}
+                            onClose={this._handlePanelClose}
+                        >
+                            <AvailableERC20TokenSelector onTokenSelect={this._handlePanelClose} />
+                        </SlidingPanel>
+                    </Container>
                 </Container>
-            </Container>
+            </React.Fragment>
         );
     }
     private readonly _handleSymbolClick = (): void => {
diff --git a/packages/instant/src/components/zero_ex_instant_provider.tsx b/packages/instant/src/components/zero_ex_instant_provider.tsx
index fa0588b71..cceb44377 100644
--- a/packages/instant/src/components/zero_ex_instant_provider.tsx
+++ b/packages/instant/src/components/zero_ex_instant_provider.tsx
@@ -94,6 +94,8 @@ export class ZeroExInstantProvider extends React.Component<ZeroExInstantProvider
         }
         // tslint:disable-next-line:no-floating-promises
         asyncData.fetchAccountInfoAndDispatchToStore(this._store);
+        // tslint:disable-next-line:no-floating-promises
+        asyncData.fetchCurrentBuyQuoteAndDispatchToStore(this._store);
         // warm up the gas price estimator cache just in case we can't
         // grab the gas price estimate when submitting the transaction
         // tslint:disable-next-line:no-floating-promises
diff --git a/packages/instant/src/constants.ts b/packages/instant/src/constants.ts
index 705313ce7..b5c4f96e4 100644
--- a/packages/instant/src/constants.ts
+++ b/packages/instant/src/constants.ts
@@ -5,6 +5,7 @@ import { AccountNotReady, AccountState, Network } from './types';
 export const BIG_NUMBER_ZERO = new BigNumber(0);
 export const ETH_DECIMALS = 18;
 export const DEFAULT_ZERO_EX_CONTAINER_SELECTOR = '#zeroExInstantContainer';
+export const INJECTED_DIV_CLASS = 'zeroExInstantResetRoot';
 export const INJECTED_DIV_ID = 'zeroExInstant';
 export const WEB_3_WRAPPER_TRANSACTION_FAILED_ERROR_MSG_PREFIX = 'Transaction failed';
 export const GWEI_IN_WEI = new BigNumber(1000000000);
diff --git a/packages/instant/src/containers/selected_erc20_asset_amount_input.ts b/packages/instant/src/containers/selected_erc20_asset_amount_input.ts
index 784eb4bd0..c550aef04 100644
--- a/packages/instant/src/containers/selected_erc20_asset_amount_input.ts
+++ b/packages/instant/src/containers/selected_erc20_asset_amount_input.ts
@@ -1,20 +1,17 @@
-import { AssetBuyer, AssetBuyerError, BuyQuote } from '@0x/asset-buyer';
+import { AssetBuyer } from '@0x/asset-buyer';
 import { AssetProxyId } from '@0x/types';
 import { BigNumber } from '@0x/utils';
-import { Web3Wrapper } from '@0x/web3-wrapper';
 import * as _ from 'lodash';
 import * as React from 'react';
 import { connect } from 'react-redux';
 import { Dispatch } from 'redux';
-import { oc } from 'ts-optchain';
 
 import { ERC20AssetAmountInput } from '../components/erc20_asset_amount_input';
 import { Action, actions } from '../redux/actions';
 import { State } from '../redux/reducer';
 import { ColorOption } from '../style/theme';
 import { AffiliateInfo, ERC20Asset, OrderProcessState } from '../types';
-import { assetUtils } from '../util/asset';
-import { errorFlasher } from '../util/error_flasher';
+import { buyQuoteUpdater } from '../util/buy_quote_updater';
 
 export interface SelectedERC20AssetAmountInputProps {
     fontColor?: ColorOption;
@@ -70,52 +67,9 @@ const mapStateToProps = (state: State, _ownProps: SelectedERC20AssetAmountInputP
     };
 };
 
-const updateBuyQuoteAsync = async (
-    assetBuyer: AssetBuyer,
-    dispatch: Dispatch<Action>,
-    asset: ERC20Asset,
-    assetAmount: BigNumber,
-    affiliateInfo?: AffiliateInfo,
-): Promise<void> => {
-    // get a new buy quote.
-    const baseUnitValue = Web3Wrapper.toBaseUnitAmount(assetAmount, asset.metaData.decimals);
-
-    // mark quote as pending
-    dispatch(actions.setQuoteRequestStatePending());
-
-    const feePercentage = oc(affiliateInfo).feePercentage();
-    let newBuyQuote: BuyQuote | undefined;
-    try {
-        newBuyQuote = await assetBuyer.getBuyQuoteAsync(asset.assetData, baseUnitValue, { feePercentage });
-    } catch (error) {
-        dispatch(actions.setQuoteRequestStateFailure());
-        let errorMessage;
-        if (error.message === AssetBuyerError.InsufficientAssetLiquidity) {
-            const assetName = assetUtils.bestNameForAsset(asset, 'of this asset');
-            errorMessage = `Not enough ${assetName} available`;
-        } else if (error.message === AssetBuyerError.InsufficientZrxLiquidity) {
-            errorMessage = 'Not enough ZRX available';
-        } else if (
-            error.message === AssetBuyerError.StandardRelayerApiError ||
-            error.message.startsWith(AssetBuyerError.AssetUnavailable)
-        ) {
-            const assetName = assetUtils.bestNameForAsset(asset, 'This asset');
-            errorMessage = `${assetName} is currently unavailable`;
-        }
-        if (!_.isUndefined(errorMessage)) {
-            errorFlasher.flashNewErrorMessage(dispatch, errorMessage);
-        } else {
-            throw error;
-        }
-        return;
-    }
-    // We have a successful new buy quote
-    errorFlasher.clearError(dispatch);
-    // invalidate the last buy quote.
-    dispatch(actions.updateLatestBuyQuote(newBuyQuote));
-};
-
-const debouncedUpdateBuyQuoteAsync = _.debounce(updateBuyQuoteAsync, 200, { trailing: true });
+const debouncedUpdateBuyQuoteAsync = _.debounce(buyQuoteUpdater.updateBuyQuoteAsync.bind(buyQuoteUpdater), 200, {
+    trailing: true,
+});
 
 const mapDispatchToProps = (
     dispatch: Dispatch<Action>,
diff --git a/packages/instant/src/index.umd.ts b/packages/instant/src/index.umd.ts
index 59d1e646f..0274db30c 100644
--- a/packages/instant/src/index.umd.ts
+++ b/packages/instant/src/index.umd.ts
@@ -2,7 +2,7 @@ import * as _ from 'lodash';
 import * as React from 'react';
 import * as ReactDOM from 'react-dom';
 
-import { DEFAULT_ZERO_EX_CONTAINER_SELECTOR, INJECTED_DIV_ID } from './constants';
+import { DEFAULT_ZERO_EX_CONTAINER_SELECTOR, INJECTED_DIV_CLASS, INJECTED_DIV_ID } from './constants';
 import { ZeroExInstantOverlay, ZeroExInstantOverlayProps } from './index';
 import { assert } from './util/assert';
 
@@ -41,6 +41,7 @@ export const render = (props: ZeroExInstantOverlayProps, selector: string = DEFA
     const appendTo = appendToIfExists as Element;
     const injectedDiv = document.createElement('div');
     injectedDiv.setAttribute('id', INJECTED_DIV_ID);
+    injectedDiv.setAttribute('class', INJECTED_DIV_CLASS);
     appendTo.appendChild(injectedDiv);
     const instantOverlayProps = {
         ...props,
diff --git a/packages/instant/src/redux/async_data.ts b/packages/instant/src/redux/async_data.ts
index 862f60e78..bff9d8814 100644
--- a/packages/instant/src/redux/async_data.ts
+++ b/packages/instant/src/redux/async_data.ts
@@ -1,8 +1,10 @@
+import { AssetProxyId } from '@0x/types';
 import * as _ from 'lodash';
 
 import { BIG_NUMBER_ZERO } from '../constants';
-import { AccountState } from '../types';
+import { AccountState, ERC20Asset } from '../types';
 import { assetUtils } from '../util/asset';
+import { buyQuoteUpdater } from '../util/buy_quote_updater';
 import { coinbaseApi } from '../util/coinbase_api';
 import { errorFlasher } from '../util/error_flasher';
 
@@ -70,4 +72,21 @@ export const asyncData = {
             return;
         }
     },
+    fetchCurrentBuyQuoteAndDispatchToStore: async (store: Store) => {
+        const { providerState, selectedAsset, selectedAssetAmount, affiliateInfo } = store.getState();
+        const assetBuyer = providerState.assetBuyer;
+        if (
+            !_.isUndefined(selectedAssetAmount) &&
+            !_.isUndefined(selectedAsset) &&
+            selectedAsset.metaData.assetProxyId === AssetProxyId.ERC20
+        ) {
+            await buyQuoteUpdater.updateBuyQuoteAsync(
+                assetBuyer,
+                store.dispatch,
+                selectedAsset as ERC20Asset,
+                selectedAssetAmount,
+                affiliateInfo,
+            );
+        }
+    },
 };
diff --git a/packages/instant/src/style/media.ts b/packages/instant/src/style/media.ts
index beabbac46..5e7aaba37 100644
--- a/packages/instant/src/style/media.ts
+++ b/packages/instant/src/style/media.ts
@@ -14,30 +14,38 @@ const generateMediaWrapper = (screenWidth: ScreenWidths) => (...args: any[]) =>
     }
 `;
 
-const media = {
+export const media = {
     small: generateMediaWrapper(ScreenWidths.Sm),
     medium: generateMediaWrapper(ScreenWidths.Md),
     large: generateMediaWrapper(ScreenWidths.Lg),
 };
 
-export interface ScreenSpecifications {
-    default: string;
-    sm?: string;
-    md?: string;
-    lg?: string;
+export interface ScreenSpecification<T> {
+    default: T;
+    sm?: T;
+    md?: T;
+    lg?: T;
 }
-export type MediaChoice = string | ScreenSpecifications;
-export const stylesForMedia = (cssPropertyName: string, choice: MediaChoice): InterpolationValue[] => {
-    if (typeof choice === 'string') {
+export type OptionallyScreenSpecific<T> = T | ScreenSpecification<T>;
+export type MediaChoice = OptionallyScreenSpecific<string>;
+/**
+ * Given a css property name and a OptionallyScreenSpecific value,
+ * generates css properties with screen-specific viewport styling
+ */
+export function stylesForMedia<T extends string | number>(
+    cssPropertyName: string,
+    choice: OptionallyScreenSpecific<T>,
+): InterpolationValue[] {
+    if (typeof choice === 'object') {
         return css`
-            ${cssPropertyName}: ${choice};
-        `;
-    }
-
-    return css`
         ${cssPropertyName}: ${choice.default};
         ${choice.lg && media.large`${cssPropertyName}: ${choice.lg}`}
         ${choice.md && media.medium`${cssPropertyName}: ${choice.md}`}
         ${choice.sm && media.small`${cssPropertyName}: ${choice.sm}`}
     `;
-};
+    } else {
+        return css`
+            ${cssPropertyName}: ${choice};
+        `;
+    }
+}
diff --git a/packages/instant/src/style/theme.ts b/packages/instant/src/style/theme.ts
index d10c9b72c..8dada2d28 100644
--- a/packages/instant/src/style/theme.ts
+++ b/packages/instant/src/style/theme.ts
@@ -1,6 +1,6 @@
 import * as styledComponents from 'styled-components';
 
-const { default: styled, css, keyframes, withTheme, ThemeProvider } = styledComponents;
+const { default: styled, css, keyframes, withTheme, createGlobalStyle, ThemeProvider } = styledComponents;
 
 export type Theme = { [key in ColorOption]: string };
 
@@ -33,4 +33,4 @@ export const theme: Theme = {
 export const transparentWhite = 'rgba(255,255,255,0.3)';
 export const overlayBlack = 'rgba(0, 0, 0, 0.6)';
 
-export { styled, css, keyframes, withTheme, ThemeProvider };
+export { styled, css, keyframes, withTheme, createGlobalStyle, ThemeProvider };
diff --git a/packages/instant/src/style/z_index.ts b/packages/instant/src/style/z_index.ts
index 727a5189d..03623f044 100644
--- a/packages/instant/src/style/z_index.ts
+++ b/packages/instant/src/style/z_index.ts
@@ -1,5 +1,6 @@
 export const zIndex = {
-    errorPopup: 1,
+    errorPopBehind: 1,
     mainContainer: 2,
     panel: 3,
+    errorPopUp: 4,
 };
diff --git a/packages/instant/src/util/buy_quote_updater.ts b/packages/instant/src/util/buy_quote_updater.ts
new file mode 100644
index 000000000..e697d3ef7
--- /dev/null
+++ b/packages/instant/src/util/buy_quote_updater.ts
@@ -0,0 +1,56 @@
+import { AssetBuyer, AssetBuyerError, BuyQuote } from '@0x/asset-buyer';
+import { BigNumber } from '@0x/utils';
+import { Web3Wrapper } from '@0x/web3-wrapper';
+import * as _ from 'lodash';
+import { Dispatch } from 'redux';
+import { oc } from 'ts-optchain';
+
+import { Action, actions } from '../redux/actions';
+import { AffiliateInfo, ERC20Asset } from '../types';
+import { assetUtils } from '../util/asset';
+import { errorFlasher } from '../util/error_flasher';
+
+export const buyQuoteUpdater = {
+    updateBuyQuoteAsync: async (
+        assetBuyer: AssetBuyer,
+        dispatch: Dispatch<Action>,
+        asset: ERC20Asset,
+        assetAmount: BigNumber,
+        affiliateInfo?: AffiliateInfo,
+    ): Promise<void> => {
+        // get a new buy quote.
+        const baseUnitValue = Web3Wrapper.toBaseUnitAmount(assetAmount, asset.metaData.decimals);
+        // mark quote as pending
+        dispatch(actions.setQuoteRequestStatePending());
+        const feePercentage = oc(affiliateInfo).feePercentage();
+        let newBuyQuote: BuyQuote | undefined;
+        try {
+            newBuyQuote = await assetBuyer.getBuyQuoteAsync(asset.assetData, baseUnitValue, { feePercentage });
+        } catch (error) {
+            dispatch(actions.setQuoteRequestStateFailure());
+            let errorMessage;
+            if (error.message === AssetBuyerError.InsufficientAssetLiquidity) {
+                const assetName = assetUtils.bestNameForAsset(asset, 'of this asset');
+                errorMessage = `Not enough ${assetName} available`;
+            } else if (error.message === AssetBuyerError.InsufficientZrxLiquidity) {
+                errorMessage = 'Not enough ZRX available';
+            } else if (
+                error.message === AssetBuyerError.StandardRelayerApiError ||
+                error.message.startsWith(AssetBuyerError.AssetUnavailable)
+            ) {
+                const assetName = assetUtils.bestNameForAsset(asset, 'This asset');
+                errorMessage = `${assetName} is currently unavailable`;
+            }
+            if (!_.isUndefined(errorMessage)) {
+                errorFlasher.flashNewErrorMessage(dispatch, errorMessage);
+            } else {
+                throw error;
+            }
+            return;
+        }
+        // We have a successful new buy quote
+        errorFlasher.clearError(dispatch);
+        // invalidate the last buy quote.
+        dispatch(actions.updateLatestBuyQuote(newBuyQuote));
+    },
+};