Vimix is a flat Material Design theme for GTK 3, GTK 2 and Gnome-Shell which supports GTK 3 and GTK 2 based desktop environments like Gnome, Unity, Budgie, Pantheon, XFCE, Mate, etc.
This theme is based on Flat-Plat gtk theme of nana-4. Thanks nana-4 sincerely for his great job!
GTK2 engines requirment:
1. GTK2 engine Murrine 0.98.1.1 or later.
2. GTK2 pixbuf engine or the gtk(2)-engines package.
yum install gtk-murrine-engine gtk2-engines
sudo apt-get install gtk2-engines-murrine gtk2-engines-pixbuf
pacman -S gtk-engine-murrine gtk-engines
Or double-click to open that script files and select "run at the terminal" at nautilus.