sunnyside agency landing page with Sass and Javascript

This was my first time working with sass and trying out the BEM methodology as well as other stuff such as dvh and it seems to have a weird behavior on mobile because of the browser Ui changing on scroll.

Also if you view on an iOS device do let me know if you have some weird behaviors with the mobile nav menu I've been having a problem where my solutions display properly on android devices but things like animations and sometimes even paddings on ios don't work well.

I'll be happy if anyone could point out what the problems are to me and how I can fix them I'm also happy to receive any tips on how to write better / less code.