Resize Videos to Fit Screen

Hi Qualtrics Community!

I need help! I need my videos to resize to fit screen/browser size. I looked at other posts and everything references an iframe code. That said, I am not seeing that in my code.

How do I adjust my videos to auto adjust to screen size? 

Here is what I have now...

<video width="auto" preload="auto" height="auto" controls="true" class="qmedia"><source type="video/mp4" src="https://feedback.ecommunity.com/CP/File.php?F=F_HmyF1HkDyr2BBzD"></video>