JSFiddle - React, Tailwind, and code Playground

HTML

<body>

<h1 id="id1">My Heading 1</h1>

<button type="button" 
onclick="document.getElementById('id1').style.color = 'red'">
Click Me!</button>

</body>

JavaScript

document.getElementById("id1").setAttribute(
   "style", "color: red; background-color: beige; padding-bottom: 2px; margin: 3px;");