Note that these modifications are highly personalized and should not be applied as-is to any Jellyfin instance. As a starting point I recommend applying [JellySkin](https://github.com/prayag17/JellySkin) to your instance and then adding snippets from [JellySkin-mod.css](https://git.levi.land/Levi/jellyskin-mod-public/src/branch/main/JellySkin-mod.css) to your Jellyfin instance, for example:
https://jellyfin.example.com > Sidebar Menu > Dashboard > General > Custom CSS code: