Navbar Interaction help needed!

As good as i was with IA1… that bad i’ am with IA2…
it must be stupid or something… but i can’t get in to work again!!!

I want a scrolling navbar…
Did follow the university video, but i do something wrong all the time!
The first action is with a “Class” and works…
When the navbar needs to scroll up… i can’t do ith with a class somehowe…
and the sign ! … i don’t know what to do!

Please help!!!

Designer:
https://preview.webflow.com/preview/refleqt-clinic?preview=1b657644dc7218208c61b3d025320e0c