.colonne_contenu_2 {
background-image: url('http://www.isurf-media.com/site_pro/userfiles/10002662-001/image/bg-col-center-2.jpg');
background-repeat:  no-repeat;
background-position: left top;
}

.colonne_contenu_3 {
background-image: url('http://www.isurf-media.com/site_pro/userfiles/10002662-001/image/bg-col-center-3.jpg');
background-repeat:  no-repeat;
background-position: left top;
}