JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<div id="content">
  Lorem ipsum dolor sit amet, consectetur adipisicing elit. Amet, modi. Similique amet aliquam magni obcaecati placeat, iusto ipsum enim, perferendis earum modi debitis praesentium, consequatur dolor soluta deserunt. Saepe, laborum.
</div>

CSS

.red-text {
  color: red
}

JavaScript

(function() {
	var class = 'red-text';
  
  $('#content').addClass('red-text');
})();