span.heading {
    font-weight: bold;
    font-size: 16px;
}

div.categoryGroup {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}

div.category {
    flex-basis: 25%;
    text-align: center;
}

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

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

    div.category img {
        width: 150px;
        height: 150px;
    }

    div.category > div.caption {
        width: 100%;
        text-align: center;
    }

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

    div.category:hover > div.caption a {
        color: #d4232d;
    }

div.rule {
    height: 1px;
    width: 100%;
    background-color: #999;
    margin-bottom: 10px;
    clear: both;
    margin-top: 10px;
}