[GNOME Shell] How to reduce the opacity?

[_albatros]

Hi,
I found this template: http://plaastik.deviantart.com/art/Minima-211705865
Perhaps the most I like.
Unfortunately, there is a high transparency, does not it look nice on a light background...
May know how to how to reduce the opacity??

PS Post translated by Google Translate

[phatypus]

Open a terminal (gnome-terminal).
Click "Edit".
Click "Profile Preferences".
Select the the "Background" tab.
Select the "Transparent background" radio button.
Change the slider to suit your needs.

[_albatros]

@phatypus, I am not talking about transparency in the terminal ...
Installed this theme? How do you install it you will understand what I mean ;)