I’ve looked through the styles and this seems like the key part:
The --1e94960e-csstools-light-dark-toggle--2 variable is controlling the background color here.
From what I can tell, the --wizard-primary-900 variable is undefined, and the --csstools-color-scheme--light variable definition looks like this:
If one changes the background-color, or adding the variables and putting random colors like green or yellow, then things look more “correct” (though frankly, I have no idea why green or yellow don’t show up: I suspect it’s an incorrect syntax?):
