JSFiddle - React, Tailwind, and code Playground

HTML

<nav>
    <ul>
        <li><a href='#'>Users</a></li>
        <li><a href='#'>Products</a></li>
    </ul>
</nav>

CSS

a {
    text-decoration:none;
    color:#333;
    letter-spacing:2px;
    border-bottom:5px solid #333;
}
li { display:inline-block; }