title: How to implement a vertical scrollbar?
body: <p>Does anyone know how to implement a vertical scrollbar for a vis.js timeline? I have read the visjs.org documentation, other threads here on stack overflow and on GitHub, but I still can't implement the scrollbar. </p>
  
  <p>Should it be enough to write <code>verticalScroll: true</code> in the configuration for a vis.js timeline? This is what I have as configuration at the moment. Do I need to write it in some other way? Or do I need to implement the vertical scroll in a totally different way?</p>
  
  <pre><code>// Configuration for the Timeline
  var options = {
      width: '100%',
      height: '100%',
      minHeight: '300px',
      padding: '0px',
      orientation: 'top',
      max: futureDate,
      min: pastDate,
      groupOrder: 'start',
      zoomMin: '86400000',
      margin: {item: {horizontal: 0, vertical: 5}, axis: 5},
      verticalScroll: true,
      zoomKey: 'ctrlKey'
  };
  </code></pre>