title: How can I make a YouTube video in an iframe go full screen?
body: <p>When i embed YouTube video in iframe it works fine but in full mode the video is not visible entire the screen</p>
  
  <pre><code>&lt;iframe src="https://www.youtube-nocookie.com/embed/rGmF2CaDiBg?rel=0" 
          frameborder="0" allow="autoplay; encrypted-media" class="iframe" 
          id="Overlayvideo" **allowfullscreen="true"**&gt;
  &lt;/iframe&gt;
  </code></pre>