div.categoryGroup {
    display: flex;
    flex-flow: wrap;
    justify-content: flex-start;
}

div.category {
    flex-basis: 25%;
    height: 172px;
}

    div.category a {
        display: inline-block;
    }

    div.category img {
        width: 175px;
        height: 124px;
    }

        div.category img:first-child {
            position: absolute;
        }

    div.category > div.caption {
        width: 175px;
        text-align: center;
    }

        div.category > div.caption a {
            font-size: 13px;
            font-weight: bold;
            text-decoration: none;
            color: #000;
        }

div.footerRule {
    height: 1px;
    width: 771px;
    background-color: #999;
    margin-bottom: 10px;
    clear: both;
}