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Landing Page navigation buttons - conditional formatting

Hello, everyone.

My question is pretty simple: how to make elements to change condition when you scroll down/up the page, like it’s implemented here (see buttons Elemets / Cases / Approach):

Ok, I could just ask AirDev guys, but I think it can be intresting not only to me:))

I’ve asked this question before and the guys at AirDev offered up their solution. In short, have a floating group at the very top that is initially hidden and display it at the appropriate scroll position. This is just my interpretation as I haven’t had the chance to actually implement it just yet.



Thank you so much again.
Couldn’t find this topic in search:(