Make Sidebar scrollable for small desktop screens

[AbdullahAleiti]

I am not able to access most of the button elements in the sidebar which I think should be scrollable to solve this issue:

I have tried to solve this issue by setting sidebar's max-height to calc(100vh - 50px) and making it scrollable. alongside some styling I came to two solutions:

1. Green scrollbar (primary-a)

2. Scrollable but hidden scrollbar
   

I am no designer. Just tried to do my best. If you approve one of these options please let me open a pull request. Here is my repo if you want to test: https://github.com/AbdullahAleiti/stacksorted.