Added simple webkit-scrollbar CSS

[Thann]

Hey guys, what do you think of this?

[Mottie]

The scrollbar code needs to be moved above the

/* inline code blocks - selector group is completed by the theme file */

section because it breaks the additional syntax highlighting selectors.

I moved it locally, and added an !important flag after each setting and I don't see the scroll bar getting styled in neither Chrome, nor Firefox... at least on a Windows platform.

[silverwind]

I don't really think we should style the scrollbar, there are a lot of dedicated styles on userstyles for that, it's a user preference I wouldn't wanna make in this style. And getting it right cross-platform and cross-browser is hard :)

[Thann]

Yeah, I agree with "doing it right is hard", that's why I wanted to get some preliminary temperature readings. I'll close the PR then =]

[silverwind]

We could add a separate repo for a (dark) scrollbar style. I once tried to mimic a OSX-style scrollbar for Firefox on Windows:

https://github.com/silverwind/overlay-scrollbars/blob/master/overlay-scrollbars.css

I think it was rather buggy, but could be a starting point :)

[Thann]

Cool, thanks, I'll play around with this over the weekend and try to get some simple multi-platform prototype.