JSFiddle - React, Tailwind, and code Playground

HTML

<div id="site-wrapper">aa</div>

CSS

.show-nav {
    color:red;
}

JavaScript

$('#site-wrapper').click(function () {
    if ($(this).hasClass('show-nav')) {
        $(this).removeClass('show-nav');
    } else {
        $(this).addClass('show-nav');
    }
});