JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" class="toggle">Toggle classes</a>

<div class="class1">...</div>

CSS

div {
  padding:10px;
  background:gray;
  color:white;
  margin-top:10px;
}

.class1 { background:red; }
.class2 { background:blue; }

JavaScript

$('.toggle').click(function () {
  $('div').toggleClass('class1 class2');
});