Try to run Opera with --use-gl=desktop flag, you won't lose hardware acceleration, but black borders gone. It works on my Mint 19.3
Best posts made by dejwid
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RE: [Solved]Menus with black bordersOpera for Linux
Latest posts made by dejwid
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RE: [Solved]Menus with black bordersOpera for Linux
Try to run Opera with --use-gl=desktop flag, you won't lose hardware acceleration, but black borders gone. It works on my Mint 19.3