body:after {
    content: ""; position: fixed; min-height: 100%; height: 100vh; top: 0; left: 0; right: 0; bottom: 0; z-index: -1; -webkit-overflow-scrolling: touch;
    background: url('https://static.tildacdn.com/tild6230-6636-4961-a161-333131383339/ds_bg.jpeg') no-repeat center; -webkit-background-size: cover; background-size: cover;
}