MrQwest/jsbin.yonisoxe.css

## jsbin.yonisoxe.css
header {
  background-color: rgba(255,255,255,1);
  position: absolute;
  top: 40%;
  left:0;
  width: 100%;
  }

nav {
  position: absolute;
  display: block;
  width: 100%;]
  left: 0;
  /* -webkit-transition: width 2s; */
}

nav ul {
  background-color: white;
  line-height: 6rem;
  text-align: right;
  display: block;
  width: 100%;
}
nav ul li {
    display: inline-block;
    text-decoration: none;
  padding-left: 1rem;
  }

.nav-button {
  line-height: 6rem;
  background-color: #e24234;
  display: inline-block;
  width: 6rem;
  text-align: center;
  color: white;
  font-size: 2rem;
  position: absolute;
  top: 40%;
    z-index: 33;
}

## jsbin.yonisoxe.html
<!DOCTYPE html>
<html>
<head>
<script src="//code.jquery.com/jquery-2.1.0.min.js"></script>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <header>
    <nav>
        <ul>
            <li><a href="/"></a>Home</li>
            <li><a href="/about">About</a></li>
            <li><a href="/portfolio">Portfolio</a></li>
            <li><a href="/contacg">Contact</a></li>
        </ul>
    </nav>
    <div class="nav-button">
    E
  </div>
  </header>


</body>
</html>

## jsbin.yonisoxe.js
$('nav').css({"top": "38%", "left": -$('nav').outerWidth()}).hide();
// console.log($('nav').width());

$('.nav-button').on('click', function() {
  var $left = $('nav');
  console.log($left.outerWidth());
    $left.show().animate({
      left: parseInt($left.css('left'),10) === 0 ?
        -$left.outerWidth() :
        0
    }, 800,"swing" /*this 'easing' argument was missing */,function() {
      console.log("completed");
        $('header').delay(500).animate({
            top: 0
        }, 1200);
    });
});
	header {
	background-color: rgba(255,255,255,1);
	position: absolute;
	top: 40%;
	left:0;
	width: 100%;
	}

	nav {
	position: absolute;
	display: block;
	width: 100%;]
	left: 0;
	/* -webkit-transition: width 2s; */
	}

	nav ul {
	background-color: white;
	line-height: 6rem;
	text-align: right;
	display: block;
	width: 100%;
	}
	nav ul li {
	display: inline-block;
	text-decoration: none;
	padding-left: 1rem;
	}

	.nav-button {
	line-height: 6rem;
	background-color: #e24234;
	display: inline-block;
	width: 6rem;
	text-align: center;
	color: white;
	font-size: 2rem;
	position: absolute;
	top: 40%;
	z-index: 33;
	}
	<!DOCTYPE html>
	<html>
	<head>
	<script src="//code.jquery.com/jquery-2.1.0.min.js"></script>
	<meta charset="utf-8">
	<title>JS Bin</title>
	</head>
	<body>
	<header>
	<nav>
	<ul>
	<li><a href="/"></a>Home</li>
	<li><a href="/about">About</a></li>
	<li><a href="/portfolio">Portfolio</a></li>
	<li><a href="/contacg">Contact</a></li>
	</ul>
	</nav>
	<div class="nav-button">
	E
	</div>
	</header>


	</body>
	</html>
	$('nav').css({"top": "38%", "left": -$('nav').outerWidth()}).hide();
	// console.log($('nav').width());

	$('.nav-button').on('click', function() {
	var $left = $('nav');
	console.log($left.outerWidth());
	$left.show().animate({
	left: parseInt($left.css('left'),10) === 0 ?
	-$left.outerWidth() :
	0
	}, 800,"swing" /this 'easing' argument was missing /,function() {
	console.log("completed");
	$('header').delay(500).animate({
	top: 0
	}, 1200);
	});
	});