body {    margin: 0;

    display: flex;

    justify-content: center;

    align-items: center;

    height: 100vh; background-size: cover; background-image: url(https://www.zandbult-doetinchem.nl/zandbultfestival-achtergrond.jpg);background-attachment: fixed;background-repeat: no-repeat;}
img {

    max-width: 90%;

    max-height: 90vh;

}