JSFiddle - React, Tailwind, and code Playground

HTML

<div id="target" class="box"></div>

CSS

.box {
      width: 100px;
      height: 100px;
      background: skyblue;
      cursor: pointer;
    }

JavaScript

'use strict';

    document.getElementById('target').addEventListener('click', function() {
      document.getElementById('target').style.background = 'pink';
    });