Scrollbar theme
Created by: mateosalta
This introduces a theme to the scrollbar, marius suggested css that should have a nicely styled scroll bar. The scrollbar has a transparent background, and looks similar to the system scrollbar https://t.me/ubports/165236
Possible regression, some sites may reserve space for the scrollbar on the right side of the screen - resulting in a gap, instead of a nice overlay.
Testing on a few sites to see if the result is sutible suggested.