#darkbox {
            position: fixed;
            z-index: 9999;
            background: rgba(0, 0, 0, 0.8) no-repeat none 50%/contain;
            box-shadow: 0 0 0 3000px rgba(0, 0, 0, 0.8);
            opacity: 0;
            visibility: hidden;
        }

        #darkbox.on {
            opacity: 1;
            visibility: visible;
            height: 90% !important;
            width: 90% !important;
            left: 5% !important;
            top: 5% !important;
        }

        #darkbox:after {
            position: absolute;
            right: 0;
            top: 0;
            font-size: 2em;
            content: "\2A2F";
            color: #fff;
            cursor: pointer;
        }