JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="list">
    <li><a href="#">Test</a></li>
    <li>
        <a href="#">Test</a>
        <ul>
            <li>Test2</li>
        </ul>
    </li>
</ul>

CSS

.list > li > a:only-child { color: red; }