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Change Video Source by Screen Size

On my portfolio site, I have a video playing in the background that I’ve embedded from Dropbox. I realized that the video would not adapt well to the different screen sizes, especially because I wanted to place text on top of the video background.

Can someone help me with custom code for changing video source based by screen size? I have different videos for the 1920, 1440, and 1280 dimensions breakpoints.