Looks like a bug in their light theme - it's using the dark theme's background. There's a theme toggle top-left to switch to the still-functioning dark theme.

Guessing they probably started with a light theme then retrofitted a dark theme & rolled it out without realising it would regress the existing light theme.

Coincidentally, I thought it was this bug that bit you; it was reported a couple of days ago https://github.com/mui/material-ui/issues/43823

I'm not seeing that colour combination -- are you sure you don't have Dark Reader or some such add-on enabled..?

Nah, I'm on my work computer. No browser add ons. Just standard chrome in dark mode. Clicking the light/dark toggle on the page (as some others suggested) does fix it.

Here is a screenshot of what I see if you're curious: https://imgur.com/a/eRchEn7

I also don't see the bugged light mode until I allow 3rd party scripts on the website in uBO