message: fix(masthead): add platform css class
diff: @@ -88,6 +88,10 @@ const Masthead = ({ navigation, ...mastheadProps }) => {
  [`${prefix}--masthead--sticky__l1`]: mastheadL1Ref.current != null,
  });
  + const hasPlatform = cx({
  + [`${prefix}--masthead__platform`]: mastheadProps.platform,
  + });
  +
  useEffect(() => {
  /**
  * Sets sticky masthead. If both L0 and L1 are present, L1 will be sticky.
  @@ -143,7 +147,7 @@ const Masthead = ({ navigation, ...mastheadProps }) => {
  <IbmLogo />
  - <div className={`${prefix}--header__search`}>
  + <div className={`${prefix}--header__search ${hasPlatform}`}>
  {navigation !== false ? (
  <MastheadTopNav
  {...mastheadProps}
  