Why do properties overlap?

Question

css

Hello. The site has a menu, which was expanded using animation (with the transform: translate3d property). In a certain block on the site, it was also necessary to use this property. And now, when you scroll to this block, the menu with the same property (transform: translate3d) is sort of slightly extended from the side, you can say "ajar". Styles somehow intersect, although the names of the classes are different. How to decide?

Answer 1

Screen? The code?