JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<div class="parent">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Deleniti qui esse illum, unde labore. Repellendus sunt, quidem eligendi aliquid architecto animi officia itaque ducimus impedit, enim laudantium quis, cupiditate optio.</div>

CSS

.parent {
  width: 400px;
  padding: 10px;
  margin: 10px;
  border: 1px solid;
  background-color: green;
}

<div class="parent">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Deleniti qui esse illum, unde labore. Repellendus sunt, quidem eligendi aliquid architecto animi officia itaque ducimus impedit, enim laudantium quis, cupiditate optio.</div>

var p = $('.parent');
p.css('border', '3px solid blue');

if(p.css('background-color', 'yellow')){
	alert('cool')
  } else {
  alert( 'Not COOL')
  }

JavaScript

var p = $('.parent');
p.css('border', '3px solid blue');

if(p.css('background-color', 'yellow')){
	alert('cool')
  } else {
  alert( 'Not COOL')
  }