Theme for Subsonic, based colors Dracula Theme https://draculatheme.com/
For Subsonic Server 6.16
To install it you have 2 options:
1- Modifying the content of any theme you want on the server, you will have to access via SSH or through the folders.
2- The best way is using "Stylus - Userstyles Manager". https://github.com/openstyles/stylus and add code.