but with discourse instead of course. I would like it to be exclusive to me or atleast a small group of people if that’s possible. I was going to add it in components before I realised it would change it for EVERYONE which isn’t what I would want.
For yourself only, you could load a personal user stylesheet in your browser with any changes you wanted.
If you want to create a theme for a specific Discourse user group, that’s not a built-in feature – but you can check out this topic for an approach that uses custom CSS to make a theme selectable only by certain user groups: Show/hide themes for specific groups?
Or perhaps install CSS Classes for Current User's Groups and use that to target your group in your code? The downside here being they can’t opt out, if you put it with your main theme.