/* --- viewport configuration ---------------------------------------------------------- */
        .viewport {
            border: 0px solid #eee;
            float: left;
            height: 200px;
            margin: 0 0px 0px 0;
            overflow: hidden;
            position: relative;
            width: 115px;
        }

        /* This is so that the 2nd thumbnail in each row fits snugly. You will want to add a similar
           class to the last thumbnail in each row to get rid of the margin-right. */
        .no-margin {
            margin-right: 0;
        }

        /* --- Link configuration that contains the image and label ----------------------------- */
        .viewport a {
            display: block;
            position: relative;
        }

        .viewport a img {
            height: 200px;
            left: 0px;
            position: relative;
            top: 0px;
            width: 115px;
        }

        /* --- Label configuration -------------------------------------------------------------- */
        .viewport a span {
            display: none;
            font-size: 2.0em;
            font-weight: bold;
            height: 100%;
            padding-top: 0px;
            position: absolute;
            text-align: center;
            text-decoration: none;
            width: 100%;
            z-index: 100;
        }
            .viewport a span em {
                display: block;
                font-size: 0.85em;
                font-weight: normal;
            }

        /* --- Dark hover background ------------------------------------------------------------ */
        .dark-background {
            background-color: rgba(15, 15, 15, 0.5);
            color: #fff;
            text-shadow: #ABABAB 0px 0px 20px;
        }
            .dark-background em {
                color: #ccc;
            }

        /* --- Light hover background ----------------------------------------------------------- */
        .light-background {
            background-color: rgba(255, 255, 255, 0.6);
            color: #A7A7A7;
            text-shadow: #fff 0px 0px 20px;
        }
            .light-background em {
                color: #707070;
            }

        /**
         * You could create multiple hover background classes for different looks depending on the
         * image type. Use your imagination!
         */