INSTALL DEPENDENCIES
# yum install gnome-classic-session
BACKUP ORIGINAL THEME
# cp /usr/share/gnome-shell/theme/gnome-classic.css gnome-classic.css.bak
# cp /usr/share/gnome-shell/extensions/window-list@gnome-shell-extensions.gcampax.github.com/classic.css classic.css.bak
REPLACE WITH GNOME CLASSIC DARK THEME
$ git clone https://github.com/ivoarch/gnome-classic-dark
$ cd gnome-classic-dark/
# cp gnome-classic-dark.css /usr/share/gnome-shell/theme/gnome-classic.css
# cp classic-dark.css /usr/share/gnome-shell/extensions/window-list@gnome-shell-extensions.gcampax.github.com/classic.css
RESTART GNOME
Press Alt+F2 type r or rt .
