Why is shaking a fixed menu in CSS?

Hello, there is a problem with a fixed menu written in CSS basic menu in list view, when scrole page in Edge it was fine, in other browser everything is OK, can't understand my bad in the code or there may be a problem in the browser?
April 19th 20 at 12:22
1 answer
April 19th 20 at 12:24
I have cited the code.

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