blackbird-gtk-theme - 0.4+20171213-3 main

Blackbird is a dark variant of the popular Bluebird and Greybird
themes from the Shimmer Project. The Shimmer Project created
the default themes for Xubuntu since 2009.
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Although originally created for Xfce, Blackbird supports other GTK+-based
environments including GNOME Shell, MATE, Cinnamon and Xfce.