Javascript tiny scroll bar

See more:

Javascript

CSS

This is more of a request than a question, I have been trying to implement a tiny scroll bar for my site for a long time now without any success.

I am a native kind of person, that is why I prefer using native JavaScript to jquery, I have tried several methods I have come up with in my head, but none seems to work.

I would like to know how to work a tiny scroll bar with native javascript, and I would appreciate any help on this topic, or better if not too stressful the answer could be placed in articles section, I would be grateful for any help. Thanks