JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>
        Ebene 1-1
        <ul>
            <li>Ebene 2-1-1</li>
            <li>
                Ebene 2-1-2
                <ul>
                    <li>Ebene 3-1-2-1</li>
                    <li>Ebene 3-1-2-2</li>
                    <li>Ebene 3-1-2-3</li>
                </ul>
            </li>
            <li>Ebene 2-1-3</li>
            <li>Ebene 2-1-4</li>
        </ul>
    </li>
    <li>
        Ebene 1-2
        <ul>
            <li>Ebene 2-2-1</li>
            <li>Ebene 2-2-2</li>
            <li>Ebene 2-2-3</li>
            <li>Ebene 2-2-4</li>
        </ul>
    </li>
</ul>