Add Windows 95 styled scrollbars

[TristanWiley]

Something like these would do
https://codepen.io/louh/pen/oZJQvm

[1j01]

Hey, that's a pretty nice recreation you've found there!
I have one a nice one to look at over here too: https://github.com/1j01/os-gui
I use ::-webkit-scrollbar-track-piece:active instead of ::-webkit-scrollbar-track:active so it doesn't darken the background of the scrollbar track when dragging by the scrollbar handle.
Also, the cursor should be reset to default for the textarea case, which I'm now realizing I don't handle, even tho I have Notepad on 98.js.org. (Maybe it didn't always work that way, and chrome's updated?)

[arturbien]

Yeah @1j01 version looks better 😊 We have to see if our scrollbars won't be to big tho (we are using 2x thicker borders than in original Windows). And we have to make them themable somehow to match other color schemes 🤔

[arturbien]

closed by #190