z index or scroll issue?

I cannot seem to figure this out as I can’t recreate it on my end. Am I able to attach a video from my client?

The issue is the footer page content and the logo overlap (they scroll over) the cart so it’s ineligible on mobile, and they have the same issue on desktop. I’m not sure if I need to lock the background page when the sidecart is open or how I can resolve this issue. I have the side cart shortcodes within header widgets.

Any advice is greatly appreciated. You can see what I mean by adding items to the cart (add 4-5 so it starts to scroll) and then resize the window with the side cart open.