html, body {
    margin: 0;
    padding: 0;
    height: 100%;
  }
  
  body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('frieren.png');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    z-index: -1;
  }