JSFiddle - React, Tailwind, and code Playground

HTML

<nav>
    <a href="#" id="toggle-Tmenu">Menu</a>
    <ul id="Tmenu">
        <li><a href="#">Topmenu</a></li>
        <li><a href="#">Profil</a></li>
        <li><a href="#">Wiki</a></li>
        <li><a href="#">Forum</a></li>
        <li><a href="#">Blog</a></li>
        <li><a href="#">Download</a></li>
    </ul>
</nav>

CSS

nav #toggle-Tmenu{
    float: right;
    padding: 5px;
    border: 2px solid #000000;
    margin-top: 20px;
}

nav ul {
    display: none;
}

JavaScript

var $btn = $('#toggle-Tmenu'),
    $menu = $('#Tmenu');

$btn.on('click', function (e) {
    $menu.toggle();
    e.preventDefault();
});