Website is tested only in Firefox 115 ESR, RedFox 140 and Supermium 132. Sorry that you stumbled upon such issue, mouse scrolling should work, at least. You are also could try smartphone for mobile layout.

Scrollbar is on the wrong side. On Firefox, I use layout.scrollbar.side to set it to the left. Not sure if there's even a way to make it match the browser prefs.

That said, the scrollbar does look pretty cool.