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Adding Classes

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About the <head>

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CSS

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HTML 

              
                <header>
		  <button class="toggle-nav">
			    <span>></span>
		  </button>
		  <ul class="nav">
			    <li class="loud"><a href="#">Home</a></li>
			    <li class="loud"><a href="#">About</a></li>
			    <li class="loud"><a href="#">Case studies</a></li>
			    <li class="loud"><a href="#">Clients</a></li>
			    <li class="loud"><a href="#">Contact</a></li>
		  </ul>
	</header>

<section>
  <h1>Example of a <strong>cool</strong> & <strong>simple</strong> reponsive navigation.</h1>
  <p>Donec facilisis tempus arcu, a hendrerit ipsum. Suspendisse a neque eget nisi pharetra cursus. Proin urna justo, ullamcorper eget leo a, laoreet lobortis mauris. Interdum et malesuada fames ac ante ipsum primis in faucibus. Sed non molestie tellus, quis consectetur tellus. Nullam vitae risus luctus, dictum tellus vel, eleifend odio. Phasellus dapibus enim eget vehicula sodales. Nam elementum est fringilla, aliquet tortor eget, luctus dui. Nullam ut interdum lorem, at dictum magna. Nulla congue, mauris non malesuada faucibus, libero urna mattis sapien, in venenatis dui tellus id massa. Fusce pulvinar egestas massa, eget suscipit nisi adipiscing id. Ut vehicula urna id cursus mattis.</p>
  <p>Donec facilisis tempus arcu, a hendrerit ipsum. Suspendisse a neque eget nisi pharetra cursus. Proin urna justo, ullamcorper eget leo a, laoreet lobortis mauris. Interdum et malesuada fames ac ante ipsum primis in faucibus. Sed non molestie tellus, quis consectetur tellus. Nullam vitae risus luctus, dictum tellus vel, eleifend odio. Phasellus dapibus enim eget vehicula sodales. Nam elementum est fringilla, aliquet tortor eget, luctus dui. Nullam ut interdum lorem, at dictum magna. Nulla congue, mauris non malesuada faucibus, libero urna mattis sapien, in venenatis dui tellus id massa. Fusce pulvinar egestas massa, eget suscipit nisi adipiscing id. Ut vehicula urna id cursus mattis.</p>
</section>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Allan);
@import url(https://fonts.googleapis.com/css?family=Droid+Sans);

/* General styles */

body{
  font: 400 20px 'Droid Sans', sans-serif;
  line-height: 1.5em;
	  background-color: #fff;  
	  color: #c0c5ce;
}

/* Style for header */

header{
	  position: relative;
	  background-color: #2c353a;
}
header ul.nav{
  	overflow: hidden;
}
header ul.nav li{
  	position: relative;
	  float: left;
	  width: 20%;
}
header ul.nav li a{
  	display: block;
	  height: 50px;
  opacity: 0;
  font: 400 1.15em 'Allan', serif;
	  line-height: 50px;
	  color: #848e92;
  text-decoration: none;
	  text-align: center;
  	cursor: default;
	  -webkit-transition: all 0.25s ease;
  	-moz-transition: all 0.25s ease;
  &:hover{
    color: #fff;
    	background-color: #222b2f;
  }
}

@media screen and (max-width: 600px){
  	header ul.nav li{
		    float: none;
    		width: 100%;
  	}
	  header ul.nav li a{
		    height: 0;
  	}
}

/* Style for header with active class name */

header.active ul.nav li a{
	  height: 120px;
  	opacity: 1;
	  line-height: 120px;
	  cursor: pointer;
}

@media screen and (max-width: 600px){
  	header.active ul.nav li a{
		    height: 60px;
		    line-height: 60px;
    border-bottom: 1px solid #222b2f;
	  }
}

/* Style for the plus button */

button.toggle-nav{
  	position: absolute;
  top: 50px;
  	left: calc(50% - 30px);
  	width: 60px;
	  height: 35px;
  	background-color: #38a6a6;
  font: 400 1.2em 'Allan', serif;
  	color: #fff;
  border: none;
  	line-height: 30px;
  	vertical-align: middle;
	  outline: none;
  cursor: pointer;
  	border-bottom-left-radius: 10px;
	  border-bottom-right-radius: 10px;
	  -webkit-transition: all 0.25s ease;
	  -moz-transition: all 0.25s ease;
}
button.toggle-nav:hover{
  	height: 50px;
}
button.toggle-nav span{
	  display: block;
  	-webkit-transform: rotate(90deg);
  	-moz-transform: rotate(90deg);
  	-webkit-transition: all 0.25s ease;
  	-moz-transition: all 0.25s ease;
}

/* Style for the plus button when header has active classe name */

header.active button.toggle-nav{
  	top: 120px;
  background-color: #256f6f;
}
header.active button.toggle-nav span{
	  -webkit-transform: rotate(270deg);
  	-moz-transform: rotate(270deg);
}

@media screen and (max-width: 600px){
	  button.toggle-nav{
		    top: 0;
		    left: 15px;
	  }
  	header.active button.toggle-nav{
    		top: 305px;
	  }
}

/* Other styles */

.loud{
	  text-transform: uppercase;
}
section{
  padding: 3em;
}
h1{
  margin: 1em 0;
  font-size: 40px;
  line-height: 1.5em;
}
p{
  margin: 1em 0;
}
strong{
  color: #93969c;
}

@media screen and (max-width: 600px){
  section{
    padding: 1.5em;
  }
}
!

JS 

              
                $(document).ready(function(){

	  var header = $('header'),
			      btn    = $('button.toggle-nav');

	  btn.on('click', function(){
		    header.toggleClass('active');
	  });

});
!
999px

Console