.fondo-fijo {
    position: fixed;
    top: 0%;
    left: 0%;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-image:url(img/bobobo\ wild\ challenger.avif);
    background-attachment: fixed;
    z-index: -1;
}
.setup{
    opacity: 0%;
}