#centrage {position: relative; z-index:20; background: #C7C7C7}
.bandeaux_promo {left: 50%; margin-left: -640px; position: absolute; width: 1280px; z-index:10;}
.bandeaux_promo .imgpromo {height: 888px; width: 1280px;}
.bandeaux_promo .ombredeco2 {height: 18px; background:url(../images/promo_ombres.png) no-repeat;}
.bandeaux_promo img {padding: 0; height: 888px; width: 1280px;}