On the home page, rather than having the horizontal scroll you can just have multiple rows for each category, that's fine - but the horizontal scroll is bad for several reasons.

The font size is a bit small for people older than mid-40s.

Forget the max-width on the main container, there's a lot of text on the page, so you should use all available screen width.

I signed up for the beta, can give more feedback on that if you wish.