How do I make iframe responsive in Daylight?

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I am currently testing Daylight for the August release. My organization uses Vimeo for videos. The height and width requirements for iframe just make it look bad in the right hand column of the new homepage. I found some CSS code for responsive iframes, but I'm not a coder and don't know how to put it into the HTML editor in the WYSIWYG.

 

Does anyone have suggestions for responsive iframe code?

 

Thanks!