JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <div>
        <div>
            <div>
                <div></div>
            </div>
            <div>
                <div></div>
            </div>
            <div></div>
        </div>
    </div>
    <div>
        <div></div>
    </div>
</div>

CSS

div { margin:20px; border:2px solid gray; min-height:20px; }
div.debug { border-color:orange; background-color:#eee; }

JavaScript

$( window ).click(function ( e ) {
    $( e.target ).toggleClass( 'debug' );
});