Thanks so much for submitting the PR! One suggestion: since theposition is related directly to the.hidden-mobile class logic, why don’t we move thatposition: fixed to the CSS above? Something like:

.grid-toc {  position: fixed;}.grid-toc.hidden-mobile { position: static; } /* this will always take priority with 2 CSS classes */

That way we handel less styling logic with the JS. And if we need to make other changes to the CSS we don’t forget about this down here and end up fighting with it.

Hey@drwpow . Thanks for your suggestion. Initially, my thought is also the same, we don't need to add CSS logic in js. Class.hidden-mobile is a factor but apart from this body of background is also a factor. So what happens is basically we open sidebar. We didn't do anything with the grid body and it does have a lot of height so the sidebar has a background overflow and its overflow. So it has a very buggy overflow. You can see two overflows going on. What you suggested is works for the sidebar not for its background body. So initially my thought is to add aclass ongrid-body and fixed it when sidebar opens and remove it when it's closed. But it has the same logic as a hidden-mobile class so I need to add another event listener and repeat the logic for the toggle. So I came to this solution as we are already doing the same thing withhidden-mobile so I fixed body height whenever the mobile sidebar is open and removed when it's closed

Ah I see what you mean now! Sorry—I was mistaken. I tested this locally and this seems to fix the issue! 🎉

I’ll merge this and we’ll deploy this this week. Thanks again.