JSFiddle - React, Tailwind, and code Playground

HTML

<div id="nav">
  <ul>
    <li><a href="\Home.html">Home</a>
    </li>
    <li><a href="\News.html">News</a>
    </li>
    <li><a href="\Content.html">Content</a>
    </li>
    <li><a href="\Products.html">Products</a>
    </li>
  </ul>
</div>

CSS

#nav ul {
  text-align: center;
  list-style: none;
  background-color: gray;
  margin: 0;
}
#nav li {
    display: inline-block;
    font-size: 1em;
    line-height: 40px;
    width: 120px;
    height: 40px;
    font-family: Arial, sans-serif;
}
#nav a {
  text-decoration: none;
  color: white;
  display: block;
  transition: .5s background-color;
}
#nav a:hover {
  background-color: black;
}