You are in the wrong folder for making the changes. Look inside the theme folder, which for you would be:
/usr/share/themes/Adwaita-dark
But, when you do, you find Adwaita-dark doesn't have a gnome-shell theme folder!
Code:
dmn@Sydney:/usr/share/themes/Adwaita-dark$ ls
gtk-2.0 gtk-3.0 index.theme
Therefore, you need to find a theme that includes a gnome-shell theme folder and set it as your Shell theme in Tweaks. Like this one (Obsidian):
Code:
dmn@Sydney:/usr/share/themes/Obsidian$ ls
assets gnome-shell gtk-3.0 index.theme openbox-3
cinnamon gtk-2.0 gtk-3.20 metacity-1
After doing that, open the
gnome-shell folder:
Code:
dmn@Sydney:/usr/share/themes/Obsidian/gnome-shell$ ls
assets gnome-shell.css gnome-shell-theme.gresource.xml
Edit file
gnome-shell.css to make the changes. Remember, you also have to set the gnome-shell theme in Tweaks:
Themes > Shell
If you like, you can keep Adwaita-dark as the
application theme and use another theme to supply the
Shell theme in Tweaks.
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