Make label optional and make sure the input field still renders properly without it

packages/website/ts/components/inputs/token_amount_input.tsx

@@ -8,9 +8,9 @@ import {BalanceBoundedInput} from 'ts/components/inputs/balance_bounded_input';
 import {InputErrMsg, Token, TokenState, ValidatedBigNumberCallback, WebsitePaths} from 'ts/types';
 
 interface TokenAmountInputProps {
-    label: string;
     token: Token;
     tokenState: TokenState;
+    label?: string;
     amount?: BigNumber;
     shouldShowIncompleteErrs: boolean;
     shouldCheckBalance: boolean;
@@ -26,8 +26,9 @@ export class TokenAmountInput extends React.Component<TokenAmountInputProps, Tok
         const amount = this.props.amount ?
             ZeroEx.toUnitAmount(this.props.amount, this.props.token.decimals) :
             undefined;
+        const hasLabel = !_.isUndefined(this.props.label);
         return (
-            <div className="flex overflow-hidden" style={{height: 84}}>
+            <div className="flex overflow-hidden" style={{height: hasLabel ? 84 : 62}}>
                 <BalanceBoundedInput
                     label={this.props.label}
                     amount={amount}
@@ -38,7 +39,7 @@ export class TokenAmountInput extends React.Component<TokenAmountInputProps, Tok
                     shouldShowIncompleteErrs={this.props.shouldShowIncompleteErrs}
                     onVisitBalancesPageClick={this.props.onVisitBalancesPageClick}
                 />
-                <div style={{paddingTop: 39}}>
+                <div style={{paddingTop: hasLabel ? 39 : 14}}>
                     {this.props.token.symbol}
                 </div>
             </div>