title: CSS scrollable percentage div
body: <p>I have a div that I'd like to have a vertical scrollbar.</p>
  
  <p>So far, I have used the following css, which works fine:</p>
  
  <pre><code>.mywrapper {
      max-height: 300px;
      overflow: auto;
  }
  </code></pre>
  
  <p>However, I would like the div to take up as much vertical space on the page as possible. Since this is the last div on the page, I'd like it to extend all the way down to the bottom, if possible.</p>