Hey there, welcome to the community.

Here’s an article to cover some basics that may help you, feel free to have a look at it:

Prototype scroll and overflow behaviour

I hope this helps a bit for you! Now, I’ll pass the mic to the community. Feel also free to share a copy of your file so the community can have a look at it. We have many experts who can share their insights and experiences for the concern here. Feel free to join in the conversation!