How to disable the drop shadow effect at the edge of windows in Gnome Shell?

Here is:

enter image description here

I try to find in gnome-tweak-tool, but I have no luck. I'm using Gnome Shell v3.8.3 on Ubuntu Gnome 13.04.

Solution 1:

(Not tested)

Edit the theme manually by adding the following to ~/.config/gtk-3.0/gtk.css:

.window-frame {box-shadow: none;}

Source: https://www.reddit.com/r/gnome/comments/2achwa/tweaking_mutter_window_shadows/