Landing Page navigation buttons - conditional formatting

[Scott]

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.

Make floating stripe appear when scrolling

How can I have a floating stripe only appear once the scroll position has reached an arbitrary threshold? Using a floating group by itself won’t work as I want the background color to span the width of the window.