Thanks, it worked!!
@fr

After another go and mostly with the help of a friend, I made it work!
There's just one small issue left, on mobile in darkmode if you cancel the menu or go to any link in the menu, the background lights up white, anyway to keep it dark?

www.hayogebauer.com (issue only on mobile version)

since I can't get it to work on my own :)

a switchable dark mode changing background/text/link styles etc.

I think an hover-option for the thumbnail grid, where all other project thumbs fade/change color, would be nice.

So you hover over a project thumb, and it doens't change, but all the remaining project thumbs change.

@mariusjopen that seems to have done it, thank you!

@audreybelaud also, to illustrate what I am talking about, hope this helps