title: Div ignoring height and overflow properties
body: <p>I am trying to make a div with a <code>height: calc(100% - 80px)</code> and an <code>overflow: scroll</code>. The div is completely ignoring both of these rules. Here is what I have attempted:</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>.tab-content {
      clear: both;
      height: calc(100% - 80px);
      overflow: auto;
  }
  
  #tutorial {
      padding: 5%;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>Tutorial
  
  &lt;div id="tutorial" class="tab-content"&gt;
      Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
      &lt;br&gt; Tutorial content
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Please alert me of where I am going wrong and how to fix the problem.</p>