Vertex is a theme for GTK 3, GTK 2, Gnome-Shell and Cinnamon. It supports GTK 3 and GTK 2 based desktop environments like Gnome, Cinnamon, Mate, XFCE, Budgie, Pantheon, etc. Themes for the Browsers Chrome/Chromium and Firefox are included, too.
The theme comes with three variants to choose from. The default variant with dark header-bars, a light variant, and a dark variant.