.lightbox {
    /* Default to hidden */
    display: none;
    /* Overlay entire screen */
    position: fixed;
    z-index: 999;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* A bit of padding around image */
    padding: 1em;
    /* Translucent background */
    background: rgba(0, 0, 0, 0.8);
}


/* Unhide the lightbox when it's the target */

.lightbox:target {
    display: block;
}

.lightbox span {
    /* Full width and height */
    display: block;
    width: 100%;
    height: 100%;
    /* Size and position background image */
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
}