Markdown editor, style/CSS lost with upgrade

Ok, I inspected the CSS in Dark theme and it works if I replace "div.CodeMirror.cm-s-default" with "div.CodeMirror.cm-s-material-darker"!
But do I really have to set this up manually now? Is there not various dark theme styles I can chose from?! I'm confused!
How come the Dark themes here don't work? GitHub - kot-behemoth/awesome-joplin: 📒 A curated list of awesome Joplin themes and tools.

Did the editor change? And if so, is there not maybe a list of new compatible themes?