src/social/templates/social/embed_video.html

   1 {% if youtube_id %}
   2 <iframe style="position: absolute; left:0;right:0;height:100%;width:100%; background-image:url('https://img.youtube.com/vi/{{ youtube_id }}/0.jpg'); background-position: 50%; background-size: cover;"
   3         type="text/html" width="100%" height="360"
   4         data-src="https://www.youtube.com/embed/{{ youtube_id }}"
   5         frameborder="0"></iframe>
   6 {% endif %}