hugo-academic/layouts/shortcodes/gdocs.html

<div class="responsive-wrap">
  <iframe src="{{ strings.TrimSuffix (index (last 1 (split (.Get 0) "/")) 0) (.Get 0) }}embed?start=false&loop=false&delayms=3000" frameborder="0" width="960" height="569" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe>
</div>