{{ $width := .Get 1 | default "560px" }}
{{ $height := .Get 2 | default "315px" }}

<div style="position: relative; width: {{ $width }}; height: {{ $height }};">
  <iframe src="https://www.youtube.com/embed/{{ .Get 0 }}" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" allowfullscreen title="YouTube Video"></iframe>
</div>