title: How to get transparent scrollbars in webkit overlay
body: <p>I've looked around a bit, but haven't found an example that works -- in Chrome at least.  I can set the color on the -webkit-scrollbar (see plunker), and it allows for setting an alpha value, but the text underneath does not show through, which seems kind of important if you are doing an overlay.  </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>    .main::-webkit-scrollbar {
        width: 20px;
        background-color: rgba(0, 200, 0, 0.1);
      }
  
      .main::-webkit-scrollbar-thumb {
        -webkit-border-radius: 10px;
        border-radius: 10px;
        background: rgba(255, 0, 0, 0.8);
      }
  
      .main {
        white-space: nowrap;
        height: 100px;
        overflow-y: overlay;
        background-color: #eee;
      }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>    &lt;div class="main"&gt;
        &lt;div&gt;1&lt;/div&gt;
        &lt;div&gt;2&lt;/div&gt;
        &lt;div&gt;3&lt;/div&gt;
        &lt;div&gt;4&lt;/div&gt;
        &lt;div&gt;5 Resize the  window so that some text is under the green, supposedly transparent, scrollbar)
        &lt;div&gt;6&lt;/div&gt;
        &lt;div&gt;7&lt;/div&gt;
        &lt;div&gt;etc&lt;/div&gt;
        &lt;div&gt;etc&lt;/div&gt;
        &lt;div&gt;etc&lt;/div&gt;
      &lt;/div&gt;
        </code></pre>
  </div>
  </div>
  </p>
  
  <p>Is there a way to do this?</p>
  
  <p><a href="https://plnkr.co/edit/HPchLXPzXxPFHcqwY5R2?p=preview" rel="nofollow noreferrer">plunker</a></p>