@media (min-width: 1200px) {
    #flexible_container {
        background-image: url("/detailpages/products/23985/img/1.jpg");

        background-position: center;
        background-repeat: no-repeat;
        background-size: cover;
        -o-background-size: cover;
        -moz-background-size: cover;
        -webkit-background-size: cover;
    }
}

@media (max-width: 1399.98px) {
    #flexible_mobile {
        background-image: url("/detailpages/products/23985/img/1.mobil.jpg");

        background-position: center;
        background-repeat: no-repeat;
        background-size: cover;
        -o-background-size: cover;
        -moz-background-size: cover;
        -webkit-background-size: cover;
    }
}