.lightbox {
    /** Default lightbox to hidden */
    display: none;
    /** Position and style */
    position: fixed;
    z-index: 999;
    width: 100%;
    height: 100%;
    text-align: center;
    top: 0;
    left: 0;
    background: rgba(0,0,0,0.8);
}

    .lightbox img {
        /** Pad the lightbox image */
        max-width: 90%;
        max-height: 80%;
        margin-top: 2%;
    }

    .lightbox:target {
        /** Remove default browser outline */
        outline: none;
        /** Unhide lightbox **/
        display: block;
    }