title: Display the list when an item hover
body: <p>I have this sample:</p>
  
  <p><a href="http://codepen.io/anon/pen/qRmwjm" rel="nofollow noreferrer">link</a></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>.show:hover .list-categories {
    max-height: inherit;
    opacity: 1;
  }
  .list-categories {
    list-style-type: none;
    padding: 0px;
    margin: 0px;
    max-height: 0px;
    opacity: 0;
    overflow: hidden;
    transition: opacity 300ms ease;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="show"&gt;show div&lt;/div&gt;
  &lt;ul class="list-categories"&gt;
    &lt;li&gt;Bed&lt;/li&gt;
    &lt;li&gt;Bed&lt;/li&gt;
    &lt;li&gt;Bed&lt;/li&gt;
    &lt;li&gt;Bed&lt;/li&gt;
    &lt;li&gt;Bed&lt;/li&gt;
    &lt;li&gt;Bed&lt;/li&gt;
  &lt;/ul&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>this code does not work. I want to display the list when hover on the item ".show"</p>
  
  <p>If you put the switch in the form (.show:hover +.list-categories) it works...but I want no plus sign.</p>
  
  <p>How can I change this code without using the plus sign?</p>