mukul29/legacy-theme-auto-switcher-gnome-extension

Change the GTK3 theme to light/dark variant based on the system color scheme

Global Theme Scheme Switcher

Extension for Gnome 45+.

Changes the GTK3 (legacy) theme variant to light/dark when the scheme is changed from Settings.

Get the extension: https://extensions.gnome.org/extension/4998/legacy-gtk3-theme-scheme-auto-switcher/

Credits

Light/Dark Theme Switcher by fthx