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The GTK theme is based on Sierra in its variant dark-solid. I really liked that theme, but! the colors still not dark enough for me. After using SublimeText under ayu-dark theme, I decided to set my Gnome based on those darker colors. The setup concept is just to be a dark, clean, and pretty to the eyes Linux customization.
To see more, you can check the screenshots album here.
If you like this GTK3/shell theme, can download latest release here.
Or install it directly using wget:
wget https://github.com/thepante/setup/archive/master.zip && unzip master.zip && cd setup-master/.themes && mv "Sierra Negra" ~/.themes && cd ../.. && rm -r setup-master & rm master.zip