JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="promos">
    <li class="expanded"><a href="#"><img src="{{skin url="images/category-button.png"}}" alt="" /></a>

        <ul class="sub-cat">
            <li><a href="foo ">Sub Item 1</a>

            </li>
            <li><a href="foo">Sub Item 2</a>

            </li>
            <li><a href="foo ">Sub Item 3</a>

            </li>
            <li><a href="foo ">Sub Item 4</a>

            </li>
        </ul>
    </li>
    <li class="expanded ">
        <img src="{{skin url=" images/category-button.png " }} " alt=" " />
    </li>
    <li class="expanded ">
        <img src="{{skin url=" images/category-button.png " }} " alt=" " />
    </li>
    <li class="expanded ">
        <img src="{{skin url=" images/category-button.png " }} " alt=" " />
    </li>
    <li class="expanded ">
        <img src="{{skin url=" images/category-button.png " }} " alt=" " />
    </li>
    <li class="expanded ">
        <img src="{{skin url=" images/category-button.png " }} " alt=" " />
    </li>
</ul>

CSS

.promos {
    margin: 0 0 10px 0;
    padding: 0;
    width: 100%;
}
.promos:after {
    content:'';
    display: table;
    clear: both;
}
/* Specifying the body only in order to override the .std ul li styling */
 body .promos > li {
    margin: 0 0 10px 0;
    list-style: none;
    text-align: center;
    position: relative;
    border: 1px solid #cccccc;
    -moz-user-select: none;
    -ms-user-select: none;
    -webkit-user-select: none;
    -o-user-select: none;
    user-select: none;
}
.promos > li:last-child {
    margin-bottom: 0;
}
.promos img {
    max-width: 100%;
    width: 100%;
}
.promos a:hover {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=80);
    opacity: 0.8;
    display: block;
}
.promos span {
    color: #FFFFFF;
    text-transform: uppercase;
    position: absolute;
    display: block;
    width: 100%;
    top: 10%;
    font-weight: 500;
    font-size: 20px;
    font-family:"Raleway", "Helvetica Neue", Verdana, Arial, sans-serif;
    text-shadow: 1px 1px 3px #555555;
}
.promos strong {
    font-weight: 600;
    font-size: 26px;
    display: block;
}
@media only screen and (min-width: 771px) {
    .promos span {
        font-size: 16px;
    }
    .promos strong {
        font-size: 17px;
    }
    /* Config: Three columns + flexible gutter */
    body .promos > li {
        float: left;
        width: 23.2142875%;
        margin-right: 2.38095%;
        /* 30 / 1260 (margin divided by total width) */
    }
    .promos > li:nth-child(4n) {
        margin-right: 0;
    }
}
@media only screen and (min-width: 880px) {
    .promos span {
        font-size: 18px;
    }
    .promos strong {
        font-size: 24px;
    }
}
 
.sub-cat li { display:inline-block; }