Altering the background color when playing a video using trailer box

I have a website page:

It uses muffin builder's trailer box to create a grid of video thumbnails which play vimeo videos within a lightbox when clicked. The client wants me to adjust the background to either solid white or a ghosted white ONLY when the videos are being played. Am I able to adjust the background behind the video player to solid white or a ghosted white so that the lightbox/player will stand out better?

Please advise

Thanks

Eric

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