I saw this years before, but since it was not widely supported, websites are dropping usage of it.

I am currently designing a website which will have scrollbars inside the design and wondering whether CSS2 have any specification on styling browser scrollbars because the default colours don't fit. If there's no specification, any reference to specific browser behaviour would be appreciated.

If there's no CSS specification on it, I would have to rely on a custom generated scrollbar using JS. References on how to build one is also appreciated.