JSFiddle - React, Tailwind, and code Playground

HTML

<div>Box 1</div>
<div>Box 2</div>
<div>Box 3</div>
<div>Box 4</div>
<div>Box 5</div>
<div>Box 6</div>

CSS

div {
    float: left;
    width: 33%;
    height: 100px;
    background: #EEE;
    border: 1px solid #CCC;
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
}