The "glass" frame around some windows

[Ralf Mardorf]

On Fri, 20 Mar 2015 10:26:26 -0700, James Moe wrote:
>On 03/11/2015 11:34 AM, jEsuSdA 8) wrote:
>> Edit gtk-3.0/gtk-widgets.css and add to end of file:
>> 
>  Where is this file normally located? I cannot find it here.

By a quick ls random search, I found only one located in

[rocketmouse at archlinux ~]$ cat /usr/share/themes/Adwaita/gtk-3.0/gtk.css 
/* Adwaita is the default theme of GTK+ 3, this file is not used */