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Color problem on video / Background

Hey There.

I have a problem. I inserted a video on my website, which has a blue background. I picked the color with the tool dedicated, to put the background color with the same color. On my laptop and on all retinas screens it seems to work (screen1) But on some other one, people can see a square like its not the good color (screen2). Any idea to fix this ?

screen1:


screen2: