title: Add scrollbar to modal window
body: <p>I have a site similar to fullPage.js where the page only covers the screen, no scrollbar with other words. However, the site contains links to modal windows with different kind of contents. What I wonder is if it's possible to make these modals scrollable considering that the rest of the site isn't.</p>
  
  <p>If I force a vertical scrollbar I get the scrollbar on the site but, however, can't use it for some reason.</p>
  
  <p>Here is the modal window:</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-js lang-js prettyprint-override"><code>$('#video-pop').click(function() {
    $('#open-menu').fadeIn(350);
  });
  
  $('#close-menu').click(function() {
    $('#open-menu').fadeOut(350);
  });</code></pre>
  <pre class="snippet-code-css lang-css prettyprint-override"><code>#open-menu {
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: 60;
    background: #060606;
    display: none;
  }
  
  .menu-content {
    position: relative;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  
  #close-menu {
    color: #fff;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;
  &lt;div id="video-pop"&gt;OPEN PAGE&lt;/div&gt;
  &lt;div id="open-menu"&gt;
    &lt;div class="menu-content"&gt;
      &lt;div id="close-menu"&gt;CLOSE PAGE&lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>JSFiddle: <a href="https://jsfiddle.net/neaqs3bv/" rel="nofollow noreferrer">https://jsfiddle.net/neaqs3bv/</a></p>