JSFiddle - React, Tailwind, and code Playground

HTML

<button class="navbar-toggle">Click me</button>
<div class="overlay">Overlay</div>
<div class="popup">Popup</div>

CSS

.overlay {
    background-color:red;
    display:none;
}
.popup {
    background-color:green;
    display:none;
}

JavaScript

$('.navbar-toggle').click(function(e){    
    $('.overlay, .popup').fadeToggle(300);
});