standarize on grey over gray spelling and other color related fixes

packages/website/ts/components/flash_messages/transaction_submitted.tsx

@@ -1,5 +1,6 @@
 import * as _ from 'lodash';
 import * as React from 'react';
+import {colors} from 'ts/utils/colors';
 
 interface TransactionSubmittedProps {
     etherScanLinkIfExists?: string;
@@ -16,7 +17,7 @@ export class TransactionSubmitted extends React.Component<TransactionSubmittedPr
                 <div>
                     Transaction submitted to the network:{' '}
                     <a
-                        style={{color: 'white'}}
+                        style={{color: colors.white}}
                         href={`${this.props.etherScanLinkIfExists}`}
                         target="_blank"
                     >