How to remove top margin in Mozilla?

Question

css

Hello, I reset all margins and paddings, still there is a 15px indent at the top of the page .. in other browsers everything works perfectly, except for firefox .. I tried to put padding-top: 1px and oferflow: hidden does not help. Maybe someone faced such a problem?

Answer 1

reset-css
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Answer 2

Thanks to everyone, I solved the problem, it turned out to be all because of the top menu, the ul li menu is displayed there and for some reason ul had an indent in the mozilla. decided margin:0;