Scrolling the sidebar menu is difficult

[jsumners]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the issue has not already been raised

Issue

When trying to scroll the left sidebar menu, it is not possible to reach the bottom with also scrolling the overall page:

side-menu-scrolling.mp4

This made it really difficult to find the routing documentation that I knew was there. I kept trying to scroll the menu to see what I knew should be there, but couldn't reach it until I loaded a longer page and started scrolling that page.

[luisorbaiceta]

I'll take a look 👀