Can’t see full Pop-Up in Mobile

I love this plugin and everything about it. It works perfectly (almost!) for what I need.

My only issue is if I open it up on mobile. It pops up, the width is fine (I know I can adjust it), but the issue is the length. The length of the content makes it so that it goes below where the screen (of a phone) ends. If I try to scroll (using my fingers) to scroll down to the unseen content, the only thing that scrolls is the page behind the Pop-up, and not the pop-up itself.

Thanks!