JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="list">
        <li>1</li>
        <li class="foo">2</li>
        <li class="foo">3</li>
        <li class="foo">4</li>
        <li>5</li>
    </ul>

CSS

.list .foo:nth-child(2n)
{
    color: green;
}