title: Inheriting width from css display: grid column and applying it to a position: fixed child
body: <p>On this example, I would like to expand the div containing ABC to the full width of its container.</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>#grid {
    display: grid;
    grid-template-columns: 50% 50%;
  }
  
  .col {
    background: #ccc;
    height: 100vh;
  }
  
  .col:nth-child(2) {
    background: #aaa;
  }
  
  .bottom {
    position: fixed;
    bottom: 0;
    background: blue;
    color: white;
    width: inherit;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="grid"&gt;
    &lt;div class="col"&gt;
      &lt;span&gt;1&lt;/span&gt;
      &lt;div class="bottom"&gt;ABC&lt;/div&gt;
    &lt;/div&gt;
    &lt;div class="col"&gt;
      &lt;span&gt;2&lt;/span&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p><a href="https://jsfiddle.net/ojms0rur/" rel="nofollow noreferrer">https://jsfiddle.net/ojms0rur/</a></p>
  
  <p>I'm getting this:
  <a href="https://i.stack.imgur.com/BcDhV.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BcDhV.png" alt="Problem Screen Capture"></a></p>
  
  <p>Where I'd like this:</p>
  
  <p><a href="https://i.stack.imgur.com/7E3Uz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7E3Uz.png" alt="Solution Sketch"></a></p>
  
  <p>How would I go about inheriting the width from the parent grid column and applying it to this fixed position element?</p>