render() {
   const duration = formatDuration(
     this.props.intl.formatMessage,
     this.props.duration
   );
   return (
     <div
       style={{
         fontSize: '80%',
         ...this.props.style,
       }}
     >
       {duration}
     </div>
   );
 }
 renderHeader() {
   const { tutorial } = this.props;
   const subtitle = tutorial.subtitle ? <div>{tutorial.subtitle}</div> : null;
   const duration = formatDuration(
     this.props.intl.formatMessage,
     tutorial.getDurationSeconds()
   );
   const subline = `${tutorial.author} - ${duration}`;
   return (
     <div
       style={{ padding: 7, backgroundColor: backgroundPlaylistHeaderColor }}
     >
       <h3 style={{ marginTop: 0 }}>
         {tutorial.title} - <a href="/tutorials">See All Tutorials</a>
       </h3>
       {subtitle}
       <div>{subline}</div>
       <ShareLinks url={tutorial.getUrl()} />
     </div>
   );
 }