#accueil #contenu #colonne-principal {
    float: left;
    padding: 40px 0 0 40px;
    width: 600px;
}

#accueil #contenu #colonne-secondaire {
    background: url("/img/fond-accueil.png") no-repeat scroll center 13px transparent;
    min-height: 630px;
    padding: 29px 0 0 30px;
    position: absolute;
    right: -9px;
    top: -33px;
    width: 268px;
    z-index: 3;
}