JSFiddle - React, Tailwind, and code Playground

HTML

<div class="selectable">
  </div>
  <div class="selectable selected">
  </div>

CSS

.selectable {
  background-color:red;
  width: 250px;
  height: 250px;
}
.selected {
  background-color:green;
}

JavaScript

$(document).ready(function() {
		$("body").click(function(e) {
			//console.log(e.target.id);
			if (e.target.className == "selectable") {
				  e.target.classList.add("selected")				  
			} 
			else {
					    			
			}
			//alert("test");
		})
})