JSFiddle - React, Tailwind, and code Playground

HTML

<div class="column">box 1</div>
<div class="column">box 2</div>
<div class="column">box 3</div>

CSS

.column {
    float: left;
    width: 33.333%;
    width: 100px;
    height: 100px;
    background: #ccc;
    margin-right: 10px;
}

.column:last-child {
    margin-right: 0;
}