I see this issue is old and still wasn't resolved
https://forums.opera.com/topic/38628/why-is-there-a-white-strip-at-the-top-of-youtube-video-in-full-screen/21
Best posts made by MaximB
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RE: Why is there a white strip at the top of youtube video in full screen?Opera for Linux
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RE: Why is there a white strip at the top of youtube video in full screen?Opera for Linux
Hello,
Not sure if it's Linux specific but when I watch Youtube videos at full screen, there is a very narrow with line on the top of the video (above the video name, across the whole screen).See example:
https://ibb.co/kq0RWq8I tested in Chrome and Firefox, and had no such issue.