To change the color or transparency of Alt+tab App switcher in Gnome 3, you need to edit the file "/usr/share/gnome-shell/theme/gnome-sll.css"
You can do much if you know css basics.
Open the file
sudo gedit /usr/share/gnome-shell/theme/gnome-sll.css
go to the section
.switcher-list
use search to find it (ctrl + f)
the line
background: rgba(R,G,B,A);
The R,G,B for rgb values of the colour
Change it by referring here
A stands for alpha channel. use a value from 0.0 to 1.0
0 is transparent.
example :
.switcher-list {
background: rgba(173,255,47,0.5);
border: 1px solid brown;
border-radius: 24px;
padding: 20px;
font-size: 9pt;
color: brown;
}
In the example above i have changed the border colour to brown.
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Happy hacking
My only remaining gripe with Gnome 3 alt+tab is that it is difficult to recognize the window you are looking for by the small indicator. Other desktops have a larger picture or a better indicator so it is quick and easy to recognize a terminal from a browser from ....
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