[FEATURE] Change colour of the Scroll Bar

[heldheld]

Is your feature request related to a problem? Please describe.
The scroll bar looks kinda off to me.

Describe the solution you'd like
Being able to change the colour like you can of almost all other elements in this mod would be nice, also if it can edit the transparency so there's the possibility to completely hide it would be absolutely perfect.

Additional context
Hiding the scroll bar completely is basically what I'd like to do, but I think being able to change the colour and transparency would make more sense as a feature.