Instead of red * https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/property.StyleManager.system-supports-accent-colors.html * https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/method.StyleManager.get_accent_color_rgba.html * https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/property.StyleManager.accent-color.html 
Instead of red