JSFiddle - React, Tailwind, and code Playground

HTML

<body id="jtl-body" class="st-container st-pusher-trans">
    <button id="navicon" class="menu-icon" data-effect="st-effect-2"></button>
    <nav id="menu_wrapper" class="st-menu st-effect-2">
    </nav>
    <ul id="menu">
    </ul>
    <main class="st-pusher">
    </main>
</body>

CSS

html,body {
    height: 100%;
    width: 100%;
}

.st-pusher {
    position: relative;
    left: 0;
    z-index: 99;
    background: #000;
    height: 100%;
    width: inherit;
    overflow: hidden;
    -webkit-transition: -webkit-transform 0.5s;
    transition: transform 0.5s;
}

.st-pusher-trans {
    -webkit-transition: width 0.5s ease-in-out, left 0.5s ease-in-out;
    transition: width 0.5s ease-in-out, left 0.5s ease-in-out;
}

.st-pusher::after {
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;

}

.st-menu-open .st-pusher::after {
	width: 100%;
	height: 100%;
	opacity: 1;
}

.st-menu {
	position: absolute;
	top: 0;
	left: 0;
	z-index: 100;
	visibility: hidden;
	width: 300px;
	height: 100%;
	-webkit-transition: all 0.5s;
	transition: all 0.5s;
}

button#navicon {
    height: 40px;
    width: 40px;
    margin-bottom: 40px;
    color: #fff;
    float: left;
    background: #000;
    border:none;
    margin-top: 12px;
}

.st-effect-2.st-menu-open .st-pusher {
	-webkit-transform: translate3d(300px, 0, 0);
	transform: translate3d(300px, 0, 0);
}

.st-effect-2.st-menu {
	z-index: 1;
}

.st-effect-2.st-menu-open .st-effect-2.st-menu {
	visibility: visible;
	-webkit-transition: -webkit-transform 0.5s;
	transition: transform 0.5s;
}

.st-effect-2.st-menu::after {
	display: none;
}

JavaScript

$(document).ready(function(){


	$( "#navicon" ).on('click',function() {

    	$(this).toggleClass('menu-icon cover-icon');

		if ( $( this ).hasClass('close-menu') ) {

			var pushW = $('main.st-pusher').width();
			var newW = pushW+300;

			$(this).removeClass('close-menu');
			$('#jtl-body').removeClass('st-menu-open');

		} else {
			var pushW = $('main.st-pusher').width();
			var newW = pushW-300;

			$('#jtl-body').addClass('st-effect-2');
			$(this).addClass('close-menu');
			$('#jtl-body').addClass('st-menu-open');	
		}
	});
 });