>

  <div class="bs-callout bs-callout-info" id="callout-modal-youtube">
    <h4>Embedding YouTube videos</h4>
    <p>Embedding YouTube videos in modals requires additional JavaScript not in Bootstrap to automatically stop playback and more. <a href="https://stackoverflow.com/questions/18622508/bootstrap-3-and-youtube-in-modal">See this helpful Stack Overflow post</a> for more information.</p>
  </div>

  <h2 id="modals-sizes">Optional sizes</h2>
  <p>Modals have two optional sizes, available via modifier c