JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
<div class="content">

</div>

CSS

.x {
  height: 5px;
  background-color: blue;
  margin: 5px;
}

JavaScript

var $x = $('.x');

setInterval(function(){
	$('.content').append('<div class="x">');
  $x.css('background-color', 'red');
}, 1000);