@media (max-width: 640px) { #contenu { margin-bottom: 0px; margin-left: auto; margin-right: auto; margin-top: 0px; } #illu { background-image: url(http://www.latelierabulles.fr/img/logo_laab_bientot_Min.jpg); height: 270px; } .marge { height: 0px; } } @media (min-width: 641px) { #contenu { margin: auto; } #illu { background-image: url(http://www.latelierabulles.fr/img/logo_laab_bientot.jpg); height: 480px; } } #construction { color: rgb(255, 255, 255); font-family: Arial, Helvetica, sans-serif; font-size: 13px; text-align: center; } #contenu { width: 320px; } #illu { margin: auto; padding: 0px; width: 320px; } #mentions { color: rgb(204, 204, 204); font-family: Arial, Helvetica, sans-serif; font-size: 10px; text-align: center; } body { background-color: rgb(45, 45, 45); margin: auto; } - See more at: http://www.csstrashman.com/styles/40656#sthash.6xS6BBDh.dpuf