Long content flows below bottom of screen

When I create content that is longer than the screen height, like a long text post or a form with a lot of fields, the content flows below the bottom of the device screen. It is scrollable, which is fine, but it doesn’t seem to be contained within any kind of window. In fact, the text flows behind any button I might have at the bottom of that screen. Right down to the physical end of the screen.

I know that Nocode Monkey offers a scrollable text component (for purchase), but is there any other way to prevent this? Or is this just because I’m only using a PWA right now?

What I’m looking for is a bottom limit (above other elements like buttons) below which the text will not flow.

Any help would be appreciated.