title: Hover over container div is highlighting nested divs individually
body: <p>I am placing a "hover" feature on class <code>.one</code> (<code>.one :hover</code>) to change the <code>background-color</code> to grey. I am expecting it to highlight both <code>div</code>s (<code>.two, .three</code>) any time I hover over the container <code>.one</code> div. </p>
  
  <p>However, what it does is hover over the two nested <code>div</code>s (<code>.two</code>, <code>.three</code>) individually.  Can someone please explain why this is so and what I have to do to make it highlight the entire div <code>.one</code> creating one single solid grey div?  </p>
  
  <p>Below is the CSS I used.</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>.one {
    width: 200px;
    display: inline-block;
  }
  
  .two {
    background-color: rgba(0, 51, 102, 1);
    width: 50px;
    height: 100px;
    float: left;
  }
  
  .three {
    background-color: rgba(0, 204, 204, 1);
    width: 150px;
    height: 100px;
    float: right;
  }
  
  .one :hover {
    background-color: rgba(153, 153, 153, 1);
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="one"&gt;
    &lt;div class="two"&gt;
    &lt;/div&gt;
    &lt;div class="three"&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>