2024-11-14, 11:28 AM
AFAIK if a client (web browser or Jellyfin Media Player) logs in as a user, it adopts the CSS in the server's Dashboard's Custom CSS box.
If a user goes to that client's Settings > Display and ticks "Disable Server CSS" then it does that, reverts that user's instance on that client to the default theme. But only for that user, on that client. After that, the user can add their own CSS to Settings > Display > Custom CSS and it will only apply to that user on that client. Logging in as a different user, or logging in as the same user on a different client, it will use the server custom CSS again.
If a user goes to that client's Settings > Display and ticks "Disable Server CSS" then it does that, reverts that user's instance on that client to the default theme. But only for that user, on that client. After that, the user can add their own CSS to Settings > Display > Custom CSS and it will only apply to that user on that client. Logging in as a different user, or logging in as the same user on a different client, it will use the server custom CSS again.