1 files changed, 35 insertions, 6 deletions
diff --git a/packages/instant/src/components/asset_amount_input.tsx b/packages/instant/src/components/asset_amount_input.tsx
index c03ef1cf3..0b22c889c 100644
--- a/packages/instant/src/components/asset_amount_input.tsx
+++ b/packages/instant/src/components/asset_amount_input.tsx
@@ -7,33 +7,62 @@ import { ERC20Asset } from '../types';
 import { assetUtils } from '../util/asset';
 import { util } from '../util/util';
 
-import { AmountInput, AmountInputProps } from './amount_input';
+import { ScalingAmountInput } from './scaling_amount_input';
 import { Container, Text } from './ui';
 
 // Asset amounts only apply to ERC20 assets
-export interface AssetAmountInputProps extends AmountInputProps {
+export interface AssetAmountInputProps {
     asset?: ERC20Asset;
     onChange: (value?: BigNumber, asset?: ERC20Asset) => void;
+    startingFontSizePx: number;
+    fontColor?: ColorOption;
 }
 
-export class AssetAmountInput extends React.Component<AssetAmountInputProps> {
+export interface AssetAmountInputState {
+    currentFontSizePx: number;
+}
+
+export class AssetAmountInput extends React.Component<AssetAmountInputProps, AssetAmountInputState> {
     public static defaultProps = {
         onChange: util.boundNoop,
     };
+    constructor(props: AssetAmountInputProps) {
+        super(props);
+        this.state = {
+            currentFontSizePx: props.startingFontSizePx,
+        };
+    }
     public render(): React.ReactNode {
         const { asset, onChange, ...rest } = this.props;
         return (
             <Container>
-                <AmountInput {...rest} onChange={this._handleChange} />
+                <Container borderBottom="1px solid rgba(255,255,255,0.3)" display="inline-block">
+                    <ScalingAmountInput
+                        {...rest}
+                        startWidthCh={3.5}
+                        endWidthCh={5}
+                        fontSizePx={this.state.currentFontSizePx}
+                        onChange={this._handleChange}
+                    />
+                </Container>
                 <Container display="inline-block" marginLeft="10px">
-                    <Text fontSize={rest.fontSize} fontColor={ColorOption.white} textTransform="uppercase">
+                    <Text
+                        fontSize={`${this.state.currentFontSizePx}px`}
+                        fontColor={ColorOption.white}
+                        textTransform="uppercase"
+                    >
                         {assetUtils.bestNameForAsset(asset)}
                     </Text>
                 </Container>
             </Container>
         );
     }
-    private readonly _handleChange = (value?: BigNumber): void => {
+    private readonly _handleChange = (value?: BigNumber, fontSize?: number): void => {
         this.props.onChange(value, this.props.asset);
+        if (!_.isUndefined(fontSize)) {
+            this.setState({
+                currentFontSizePx: fontSize,
+            });
+        }
     };
 }