JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>1</li>
    <li>2</li>
    <li>3</li>
    <li>4</li>
    <li>5</li>
    <li>6</li>
</ul>

CSS

ul {
    list-style: none;
    overflow: hidden;
    border: 1px solid #333;
    padding: 10px 10px 0 10px;
    column-count: 3;
    -moz-column-count: 3;
    -webkit-column-count: 3;
}

ul li {
    margin-bottom: 10px;
    padding: 25px 0;
    display: block;
    background: black;
    color: white;
    font-family: Arial, Helvatica, sans-serif;
    text-align: center;
    font-size: 20px;
    font-weight: bold;
}