JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
 <li>
  <a href="#Tab1">Tab 1</a>
 </li>
 <li>
  <a href="#Tab2">Tab 2</a>
 </li>
</ul>

CSS

ul li a {background-color: white;}
ul li a:hover {background-color: black;}
ul li a:focus {background-color: black;}