JSFiddle - React, Tailwind, and code Playground

HTML

<nav>
    <ul>
        <li><a href="#">Dropdown Menu</a>

            <ul>
                <li><a href="#">Dropdown Link 1</a>

                </li>
                <li><a href="#">Dropdown Link 2</a>

                </li>
            </ul>
        </li>
    </ul>
</nav>

CSS

nav ul ul {
    display: none;
}
nav ul li:hover > ul {
    display: block;
}