message: using emotion css for inner styles
diff: +import { css as emotionCss } from 'emotion'
  import * as React from 'react'
  import { Color, withStyles, WithStylesProps } from '../../../styles'
  @@ -33,7 +34,7 @@ export class Icon extends React.PureComponent<IconProps> {
  return (
  <span title={this.props.title} className={this.props.css(styles.span)}>
  - <SelectedIcon className={this.props.css(styles.icon)} aria-hidden='true' />
  + <SelectedIcon className={emotionCss(styles.icon)} aria-hidden='true' />
  </span>
  )
  }
  