I can’t see that this demo works @brian1, unless I’m missing something…
When viewing the demo in firefox, the repeating group doesn’t scroll to the bottom of the list when the browser is shortened and page reloaded.
When viewing the demo in chrome, the repeating group doesn’t scroll at all.
I tried several attempts at CSS over here: How to make Repeating Group height dynamic to fit screen resolution? but I get the same result unfortunately.
Researching the forum, it seems Bubblers have been asking for this for some time. It would be great to have this feature, and would mean we could have resizeable repeating groups with vertical scrolling (perfect for apps!). I’ve asked @emmanuel but the feedback is that custom CSS is not supported. Reading between the lines, I’m assuming it would be a real headache for the Bubble team to provide this otherwise I’m guessing it would already be with us, or at least they would be saying it’s on the way 
So it seems that vertical scrolling in a repeating group can only be used for fixed-height UX, not resizeable for multiple viewport sizes. Unless anyone has a good suggestion?