Question on use of upstream code to generate userstyle for sr.ht

### Is there an existing issue outlining your problem?

- [x] I have searched the existing issues and they do not solve my problem.

### Describe your issue.

I'm trying create a user style for [sr.ht](https://sr.ht/). sr.ht uses variables in its upstream scss code to theme the app, which are removed as part of the compilation process. So, instead of attempting to find and theme individual elements via inspect element, I would like to patch the upstream scss code to generate a valid userstyle. Would this be an acceptable method of userstyle creation for this repo?

No repository files, tests, or entry points are named. Start by reviewing the repository's userstyle contribution guidance and existing sr.ht-related styles, then clarify whether patching upstream SCSS is accepted and document the agreed workflow.

Written by the indexing model from the issue text.