JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container1">			
        <div >xxxxxxxxxxxxxxx</div>
        <div >xxxxxxxxxxxxxxx</div>
        <div >xxxxxxxxxxxxxxx</div>
        <div >xxxxxxxxxxxxxxx</div>							
		</div>
<br/>
<input type="button" id="click"  value="windowization! :)"/>

CSS

.window{    
  margin: 30px;
  padding: 10px;
  border-style: solid;  
  border-width: 20px 8px 8px 8px;
  border-color: #444;
  border-radius: 10px;
  box-shadow: 2px 2px 10px 1px #111111;
}

JavaScript

document.getElementById("click").onclick=function(){
				 	document.getElementById("container1").className+=" window ";
				 }