How to assign a theme to a group?

Support
4

You can kind-of do it. We add a class to the body tag for primary groups, for example .primary-group-team. So you could wrap your entire theme CSS in

body.primary-group-team {
    // All theme styles here
}

There’s also a .staff class on body, of course this could make your CSS a bit large if you’re trying to cram a bunch of groups in one customization.