Yes, I did put "on" for css override" in "ADVANCED SETTINGS" section of style template...
When I get on my css file by url
http://www.maquette.gedautomobile.com/t ... erride.css I can see :
/*
#------------------------------------------------------------------------
# Store Box - March Joomla! template (for Joomla 2.5)
#
# Copyright (C) 2007-2013 Gavick.com. All Rights Reserved.
# License: Copyrighted Commercial Software
# Website:
http://www.gavick.com# Support:
[email protected] */
/* Here you can include your override CSS styles */
body {
background: #fff url('../images/bg.png');
background-repeat:repeat-x;
background-repeat-y: no-repeat;
}