Now there is no problem. I did these things.
blackcoffez 2 days ago
I found a way to fix in my Opera:
Setting -> advanced setting -> system -> turn off "Use hardware acceleration when available".
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I downloaded opera to my new pc 2 days ago I deleted it 3x
times and install again but my problem still contunie. When i try to write
message the background become to grey. When my cursor on message box, it
becomes turquois its not a copy paste process or mouse problem, i guess a
visual bug or someting becauce it happens only few websites. I use opera
with my other pc but it has not same problem. Im waiting your help. !