Custom Scrollbar for Side Nav

[meducation-github]

Hi GitBook,

I am a big fan of your product, it is amazing and works like a charm. There is this one thing that is bothering me in UI i.e. legacy Scroll bar in the left Menu where the title of the page is shown. If you could make it into a custom scrollbar which hides by default but when you scroll over it it appears and it is custom.

Left nav Scrollbar:

You could make it like the YouTube website left nav scrollbar.

Thank You.