JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="el">
    <li><div>1<br/>1</div>
    <li><div>2</div>
    <li><div>3</div>
    <li><div>4</div>
    <li><div>5</div>
    <li><div>6</div>

CSS

.el {
    margin: 10px auto;
    padding: 10px;
    background: #f4f4f4;
    min-width: 500px;
    max-width: 600px;
}
.el > li {
    display: inline-block;
    *display: inline; /* IE7 inline-block hack */
    *zoom: 1;
    width: 33.333%;
    vertical-align: top;
}
.el > li > div {
    height: 50px;
    background: #c4c4c4;
    margin: 10px;
    
}