html, body {
    background: url("/img/umira-construccion.png") no-repeat;
    background-size: contain;
    background-attachment: fixed;
    background-position: center center;
    min-height: 100%;
    min-width: 100%;
    --webkit-background-size: 100%;
    --moz-background-size: contain;
    --o-background-size: contain;
}

html {
    background-color: black;
}

main {
    height: 100%;
}