Fullscreen button. iFrame responsive for mobiles?

Hi Histos ,

In order to make your embedded iframe responsive, you need to wrap the iframe in a div and apply inline css. Follow these simple steps:

1. Get the iframe embed code and paste in into your HTML page.
2. Set the height and the width attributes of the iframe tag to 100%
3. Change the CSS position of the iframe tag to 'absolute' and set the left and top CSS parameters to '0'
4. Add a div container around the iframe tag as it is shown by the following sample code. The value of the 'padding-bottom' parameter is based on the aspect ratio of the content (in case of a 16:9 video the calculation is 9/16 = 0.5625)

Your final html code should look similar to the below:

 <div id="Container"
     style="padding-bottom:56.25%; position:relative; display:block; width: 100%">
     <iframe id="ViostreamIframe" width="100%" height="100%" src="https://publish.viostream.com/player/iframe/s0m3m3d14?playerKey=s0m3p14y3r" frameborder="0" allowfullscreen="" style="position:absolute; top:0; left: 0"></iframe>
</div>

refer： https://help.viostream.com/frequently-asked-questions/how-do-i-make-an-iframe-embed-responsive 

And about  Fullscreen Button in mobile version,refer:

https://developers.google.com/web/fundamentals/native-hardware/fullscreen 

Best Regards

Lucien