gtk-engines-unico (theme engine for GTK+3)
Unico is a Gtk+ engine that aims to be the more complete yet
powerful theming engine for Gtk+ 3.0 and newer.
It's the first Gtk+ engine written with Gtk+ style context APIs
in mind, using CSS as first class citizen.
Maintained by: Matteo Bernardini
(the SlackBuild does not include the source)