[cairo] How can I draw this? (without blur hopefully)

[Andrea Cimitan]

As you can see in the first button1 button, the dark gradient seems to
stop before reaching the left and right edges of the button itself,
likeif there was a blur or a glow outside it.
I would like to draw that style with cairo, though I don't know if
there's a real way to do it :)
Any help? :)
-- 
Andrea Cimitan - http://www.cimitan.com
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