I recently switched from gnome to i3 and was wondering how to change my color theme. I want to set a custom bg and text color as well as font. I have the yaru-dark theme using an app called "Customize look and feel", although I was able to change it to the same theme using another app called "GTK Ch-theme".
The issue is that I can't change it to custom colors. I want to change the grey color to black. When I try to do this using the "Customize look and feel" app, there is an option to do this. However, the option is disabled and I need to install lxsessions and change my current window manager for that, which I don’t want to. How can I set a custom theme without switching to LXDE?