<div class="ratio ratio-16x9">
    <iframe src="https://www.youtube.com/embed/zpOULjyy-n8?rel=0" title="YouTube video" allowfullscreen></iframe>
</div>
<div class="ratio ratio-{{ ratio }}">
  <iframe src="https://www.youtube.com/embed/zpOULjyy-n8?rel=0"
          title="YouTube video"
          allowfullscreen></iframe>
</div>
{
  "ratio": "16x9"
}

No notes defined.