JSFiddle - React, Tailwind, and code Playground

HTML

<div class="splat">
  
</div>

CSS

.splat {
	width: 400px;
	height: 400px;
	background: blue;
    position: absolute;
    top: 100px;
    left: 100px;
}

JavaScript

jQuery(document).ready(function($){
    $(document).on('click', '.splat', function(e){
        $(this).animate({width:"45px"},800);
    });
});