https://gitlab.com/gitlab-org/gitter/webapp/issues/1410

<div class="app-layout app-layout--left-menu pinned">
  <div id="iframe-region" class="iframe-region">
    <iframe id="content-frame" src="/BSDs/FreeBSD/~chat#initial" style="display: block; width: 100%; height: 100%; border: 0;" frameBorder="0"></iframe>
    <div id="loading-frame" class="loading-frame hide">
      <div class="loader"></div>
    </div>
  </div>
</div>