That's odd because the image and its bottom div (that includes image title and close button) are set up to only fill the viewport.
Must have to do with your phone's resolution. (check android settings > display, and search for the screen resolution (HxV pixels)
1600x720
Ok, I'll give it a try and see if I can get that.
You're the very first reporting this.
I'm sure many aren't using the accessibility options. I just like the text bigger.