CSS#
You can override the GTK theme that Zrythm uses along with
much of the color scheme in a special CSS file. It is
a good idea to start by copying the theme from your Zrythm
installation directory
(normally /usr/share/zrythm/themes/zrythm-theme.css on
GNU/Linux and share/zrythm/themes/zrythm-theme.css in
the installation path on Windows or the Application contents
on MacOS.
You should create a file called theme.css under the
themes directory in your Zrythm directory. For example,
if your Zrythm directory is /home/me/zrythm, you should
create a file at /home/me/zrythm/themes/theme.css.
Color Scheme#
Inside the theme file, you will find lots of colors defined
using @define-color. You can override these with your
own colors and Zrythm will use them where possible.
Other GTK-Specific Rules#
You will find lots of information about changing CSS rules for general GTK widgets online.
Here are some links by official GNOME sources: