This happened to me the other day (right hand, right thumb) when I needed to close an email modal with a tiny x in the top-left corner.

So I love how you broke it down, and how you tied it into the scroll up bar.

My question then isn't shouldn't no mobile menu menu be "full-screen"? It looks like it should be 2/3rds of the screen and full-width, because no one can tap the top.