Bug: Jellyfin 10.9 update breaks theme formatting (login is shifted and once logged in blank screen)

[tbelway]

Describe the bug
If you use the main.css then the login screen is squished (see screenshot) and if you log in you get a black screen (I don't think a screenshot is necessary for this...).

To Reproduce
Steps to reproduce the behavior:

1. Use jellyfin 10.9
2. Apply the import of the main.css in the custom css section and hit save
3. Try to login
4. If you disable the css, then login, then enable the css, welcome to a black screen.

Expected behavior
Theme is functional. Though the main page DOES explicitly state 10.8...

Screenshots

Desktop (please complete the following information):

• OS: Fedora Linux 40 (Server Edition)
• Browser: Firefox
• Version: 124.0.1

Smartphone (please complete the following information):

• Device: Android (pixel 6 pro)
• OS: Android 14
• Browser: Firefox, android app, chrome
• Version: various

Additional context
Theme does not work with 10.9 :(

[prayag17]

#120 (comment)