CSS files are so long 3000-4000 lines. It's to hard to find the class name, like I wanted to change the background of nautilus so I changed RGB values from css file of nordic theme. (I am using these theme). but nothing happened. Then I completely removed the whole nautilus section and then restarted nothing was broken everything was fine.
If I removed that lines the theme should get changed but why it didn't happened, but removing the whole css file made everything transparent. This means that I was changing correct css file.
So instead of changing main file. It is possible to make a .config file for that app. But how can I know what should I name that .config file and In which folder should I keep that file also which selectors I have to use to make changes like background colour, change height of title bar of app, to change buttons on title bar, side-bar of nautilus, their colours etc.
every app has config files of different names in there .config/appfolder, how to know about that like if I want to change the appearance of Telegram, Gedit, firefox or any app.
one more question,
I am using Ubuntu 20.04 LTS so does upgrading my pc to Ubuntu 22.04 LTS, will make my configs useless or it will work just fine.
Thanks