JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrap">
	<header>
		<div class="inner relative">
			<a class="logo" href="#"><img src="https://www.gravatar.com/avatar/851659509f07dd2fe27882da61f0da0a?s=64" alt="fresh design web"></a>
			<a id="menu-toggle" class="button dark" href="#"><i class="icon-reorder"></i></a>
			<nav id="navigation">
				<ul id="main-menu">
					<li class="current-menu-item"><a href="http://www.freshdesignweb.com">Home</a></li>
					<li class="parent">
						<a href="#">Features</a>
						<ul class="sub-menu">
							<li><a href="#"><i class="icon-wrench"></i> Elements</a></li>
							<li><a href="#"><i class="icon-credit-card"></i>  Pricing Tables</a></li>
							<li><a href="#"><i class="icon-gift"></i> Icons</a></li>
							<li>
								<a class="parent" href="#"><i class="icon-file-alt"></i> Pages</a>
								<ul class="sub-menu">
									<li><a href="#">Full Width</a></li>
									<li><a href="#">Left Sidebar</a></li>
									<li><a href="#">Right Sidebar</a></li>
									<li><a href="#">Double Sidebar</a></li>
								</ul>
							</li>
						</ul>
					</li>
					<li><a href="#">Portfolio</a></li>
					<li class="parent">
						<a href="#">Blog</a>
						<ul class="sub-menu">
							<li><a href="#">Large Image</a></li>
							<li><a href="#">Medium Image</a></li>
							<li><a href="#">Masonry</a></li>
							<li>
								<a class="parent" href="#"><i class="icon-file-alt"></i> Pages ></a>
								<ul class="sub-menu">
									<li><a href="#">Full Width</a></li>
									<li><a href="#">Left Sidebar</a></li>
									<li><a href="#">Right Sidebar</a></li>
									<li><a href="#">Double Sidebar</a></li>
								</ul>
							</li>
							<li><a href="#">Double Sidebar</a></li>
							<li><a href="#">Single Post</a></li>
						</ul>
					</li>
					<li><a href="#">Contact</a></li>
				</ul>
			</nav>
			<div class="clear"></div>
		</div>
	</header>

CSS

body {
	background-color: #eee;
	background-image: url(../images/patterns/light_toast.png);
	color: #666;
	font-family: 'Open Sans', sans-serif;
	font-size: 12px;
	margin:0px;
	padding:0px;
}

a {
	color: #23dbdb;
	text-decoration: none;
}

a:hover {
	color: #000;
}
ol, ul {
	list-style: none;
	padding:0px;
	margin:0px;
}
#wrap {
	margin: 0 auto;
}

.inner {
	margin: 0 auto;
	max-width: 940px;
	padding: 0 40px;
}

.relative {
	position: relative;
}

.right {
	float: right;
}

.left {
	float: left;
}

/* HEADER */
#wrap > header {
	background-color: #333;
	padding-bottom: 20px;
}
.logo {
	display: inline-block;
	font-size: 0;
	padding-top:15px;
}
#navigation {
	position: absolute;
	right: 40px;
	bottom: 0px;
}

#menu-toggle {
	display: none;
	float: right;
}

/* HEADER > MENU */
#main-menu {
	float: right;
	font-size: 0;
	margin: 10px 0;
}

#main-menu > li {
	display: inline-block;
	margin-left: 30px;
	padding: 2px 0;
}

#main-menu > li.parent {
	background-image: url(../images/plus-gray.png);
	background-size: 7px 7px;
	background-repeat: no-repeat;
	background-position: left center;
}

#main-menu > li.parent > a {
	padding-left: 14px;
}

#main-menu > li > a {
	color: #eee;
	font-size: 14px;
	line-height: 14px;
	padding: 30px 0;
	text-decoration:none;
}

#main-menu > li:hover > a,
#main-menu > li.current-menu-item > a {
	color: #23dbdb;
}

/* HEADER > MENU > DROPDOWN */
#main-menu li {
	position: relative;
}

ul.sub-menu { /* level 2 */
	display: none;
	left: 0px;
	top: 38px;
	padding-top: 10px;
	position: absolute;
	width: 150px;
	z-index: 9999;
}

ul.sub-menu ul.sub-menu { /* level 3+ */
	margin-top: -1px;
	padding-top: 0;
	left: 149px;
	top: 0px;
}

ul.sub-menu > li > a {
	background-color: #333;
	border: 1px solid #444;
	border-top: none;
	color: #bbb;
	display: block;
	font-size: 12px;
	line-height: 15px;
	padding: 10px 12px;
}

ul.sub-menu > li > a:hover {
	background-color: #2a2a2a; 
	color: #fff;
}

ul.sub-menu > li:first-child {
	border-top: 3px solid...

JavaScript

$(document).ready(function() {

	/* MAIN MENU */
	$('#main-menu > li:has(ul.sub-menu)').addClass('parent');
	$('ul.sub-menu > li:has(ul.sub-menu) > a').addClass('parent');

	$('#menu-toggle').click(function() {
		$('#main-menu').slideToggle(300);
		return false;
	});

	$(window).resize(function() {
		if ($(window).width() > 700) {
			$('#main-menu').removeAttr('style');
		}
	});

});