title: react-custom-scrollbars - how to change horizontal scroll track color?
body: <p>I use <a href="https://github.com/malte-wessel/react-custom-scrollbars" rel="nofollow noreferrer">react-custom-scrollbars</a> for customized horizontal scroll.</p>
  
  <pre><code>&lt;Scrollbars ref="scrollio" 
      onScroll={this.onScroll} 
      renderThumbHorizontal={props =&gt; &lt;div {...props} className="thumb-horizontal"/&gt;}
      autoHeight='true' autoHeightMax={Number.MAX_VALUE} renderTrackVertical={() =&gt; &lt;div&gt;&lt;/div&gt;} &gt;
  
      &lt;p&gt;Some great content...Some great content...&lt;/p&gt;
  
  &lt;/Scrollbars&gt;
  </code></pre>
  
  <p>And css file contains:</p>
  
  <pre><code>.thumb-horizontal {
    background-color: red;
    height: 10px !important;
  }
  </code></pre>
  
  <p>The code above works well and I get the scroll with red thumb but after adding track info scroll view disappears:</p>
  
  <pre><code>renderTrackHorizontal={props =&gt; &lt;div {...props} className="track-horizontal"/&gt;} 
  </code></pre>
  
  <p>And:</p>
  
  <pre><code>.track-horizontal {
    background-color: blue;
    height: 10px !important;
  }
  </code></pre>
  
  <p>How to set horizontal scroll track style in <code>react-custom-scrollbars</code>?</p>