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:first-child,
.list .foo:first-child {
  color: red;
}