body.page718 #ios-bg {
    display: none
}

@supports (-webkit-overflow-scrolling: touch) {
    body.page718 #ios-bg {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: -1;
        background: url("//fileadmin/alle/bilder/improcup/teams/Dynami_Duo_Quadrat_2010.jpg") top center no-repeat transparent;
        background-size: cover;
    }
}

@supports not (-webkit-overflow-scrolling: touch) {
    body.page718 {
        background: url("//fileadmin/alle/bilder/improcup/teams/Dynami_Duo_Quadrat_2010.jpg") top center no-repeat transparent;
        background-size: cover;
        background-attachment: fixed;
    }
}
</style >