message: replace lightWhite with rgba color
diff: @@ -35,7 +35,7 @@ ToolbarButton.defaultProps = {
  const styles = theme => ({
  toolbarBtn: {
  cursor: 'pointer',
  - color: theme.palette.common.lightWhite,
  + color: 'rgba(255, 255, 255, 0.54)',
  },
  toolbarBtnSelected: {
  color: theme.palette.common.white,
  