I added some small modification to Adwaita Dark which originally made by A. Felipe.
remove some junk codes.
*For those who already have had Adwaita Dark:
Download the file, extract, and place the metacity-theme-3.xml in your /usr/share/themes/Adwaita Dark/metacity-1
*For those who don't have Adwaita Dark:
Click http://felipe.netai.net/proyectos/gnome-shell/themes/Adwaita-Dark.tar.gz to download it.
"Once you have downloaded the theme you’ll need to first ‘unzip’ the archive (right click > extract here) then manually install it as follows:
Open a Terminal
type: gksu nautilus /usr/share/themes
Move the extracted Adwaita Dark folder to the ‘usr/share/themes’ folder
Apply the Adwaita Dark theme using GNOME Tweak Tool"
After that, follow the first instruction.
You can find more about the original Adwaita Dark theme http://www.omgubuntu.co.uk/2011/10/use-adwaita-dark-as-your-system-theme/