Version 13.0 (14608.1.49) for Safari
Release 92 (Safari 13.1, WebKit 14609.1.4) for Safari Technology Preview
If you expand options enough to go below the end of the window, then the sidebar does not become scrollable, as it does on Firefox and Chrome.
Not only on Safari. Chrome Version 76.0.3809.132 – completely defaced & mouse wheel is not working :(


BTW: such website failures are a good argument against publishing the website on releases only. We need the ability to react to such failures quicker than the release cycle.
@anatoliykmetyuk try clearing the cache, idk its a weird trick, mine rendered strange until I changed the user agent and back again
@bishabosha, ok, thanks, it worked.
Why does it behave that way though? Not the best user experience
Our server might be sending incorrect HTTP caching headers which prevent proper cache invalidation.
Regarding the sidebar, it seems that the overflow property doesn't work with Safari as I've written it. It shouldn't be hard to fix, I'll do it tomorrow.
As for the rest, it looks like the new HTML file has been used with the old CSS files, causing this upside-down result (probably due to caching problems).
Fixed in #7288