JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>Element one
        <ul>
            <li><a>Element two</a>
                <ul>
                    <li><a>Element three</a></li>
                </ul>
            </li>
        </ul>
    </li>
</ul>

CSS

ul ul li:first-child > a{
    background:red;
    
}