I am a newbee with Suffusion, which is quite great btw.
I created a child theme to install the French translation of Suffusion, with a style.css limited to importing the suffusion's style.css.
The background color of my site became light green instead of the light grey I was using. No change after resetting the skin to light grey with orange.
To fix that, I added the set of the background color for wrapper in style.css (see below). I am not sure it is what should be done, hence my post.
Theme Name: Suffusion FR
Description: Child theme for the Suffusion theme
Author: Pierre Laporte