Oomox-gtk-theme is a fork of Numix-gtk-theme with slightly different visual design choices and more customization capabilities. It can be used in Themix/Oomox app.
I've tried with the Materia and Numix options, when setting the theme created by Oomox, I end up with a Window border that has about a two pixel gap between the edge of the Window and the border. I am not seeing any border thickness options in the create tool. Doesn't seem to happen on all windows, Chrome and gnome specific apps seem unaffected.
From @jwhipp on January 23, 2018 17:57
I'm on Ubuntu 17.01 with Gnome 3.26.
I've tried with the Materia and Numix options, when setting the theme created by Oomox, I end up with a Window border that has about a two pixel gap between the edge of the Window and the border. I am not seeing any border thickness options in the create tool. Doesn't seem to happen on all windows, Chrome and gnome specific apps seem unaffected.
Attached screen shot is of the Slack Linux app.
Copied from original issue: actionless/oomox#121