JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
    <li>List item</li>
</ul>

CSS

ul 
{
	list-style-type: none;
	counter-reset: section;

	-moz-column-count: 3;
    -moz-column-gap: 20px;
    -webkit-column-count: 3;
    -webkit-column-gap: 20px;
    column-count: 3;
    column-gap: 20px;
}

ul li 
{
	padding-left: 30px;
	position: relative;
}

ul li:before 
{
    counter-increment: section;
	content: counter(section) ".";
	margin: 0 0 0 -34px;
	text-align: right;
	width: 2em;
	display: inline-block;
	position: absolute;
	height: 100%;
}