ref: d2e022f2a7c3654cd1aaf24ea9134e61cb913cec
dir: /docs/layouts/shortcodes/youtube.html/
<div class="video-container">
<iframe class="youtube-player" type="text/html" width="100%" height="auto" src="http://www.youtube.com/embed/{{ index .Params 0 }}" allowfullscreen frameborder="0">
</iframe>
</div>