Copy this markup to App.js after npm start.
<hr/>
<div className="hover:bg-gray-50">hover 50</div>
<div className="hover:bg-gray-100">hover 100</div>
<div className="hover:bg-gray-200">hover 200</div>
<div className="hover:bg-gray-300">hover 300</div>
<div className="hover:bg-gray-400">hover 400</div>
<div className="hover:bg-gray-500">hover 500</div>