Edit in JSFiddle

$('#nav-toggle').click(function(){
  $('body').toggleClass('open');
});

<header id="top-head">
	<div id="top-head-inner">
		<div id="nav-toggle">
			<div>
				<span></span>
				<span></span>
				<span></span>
			</div>
		</div>
		<nav id="global-nav">
			<ul>
				<li><a href="#">HOME</a></li>
				<li><a href="#">PRODUCT</a></li>
				<li><a href="#">WORKS</a></li>
				<li><a href="#">COMPANY</a></li>
				<li><a href="#">CONTACT</a></li>
			</ul>
		</nav>
		<div id="nav-bg"></div>
	</div>
</header>

@import url(http://fonts.googleapis.com/css?family=Lato);
body {
  font-family: 'Lato', sans-serif;
  background: #eee;
}
/* ***********************************************************
* #global-nav
* *********************************************************** */
.open #global-nav {
  z-index: 1000;
  visibility: visible;
}
#global-nav {
  visibility: hidden;
  position: fixed;
  display: table;
  vertical-align: middle;
  color: #fff;
  top: 0;
  height: 100%;
  width: 100%;
  text-align: center;
  font-size: 16px;
}
#global-nav ul {
  display: table-cell;
  vertical-align: middle;
  list-style: none;
}
#global-nav a {
  color: #fff;
  text-decoration: none;
  display: block;
  padding: 10px 0;
}

/* ***********************************************************
* nav-list
* *********************************************************** */
#global-nav ul li {
  opacity: 0;
  -webkit-transform: scaleX(0) translateX(-260px);
  transform: scaleX(0) translateX(-260px);
  -webkit-transition: none;
  transition: none;
}
.open #global-nav ul li {
  opacity: 1;
  -webkit-transform: scaleX(1) translateX(0);
  transform: scaleX(1) translateX(0);

  -webkit-transition: all .3s ease-out;
  transition: all .3s ease-out;

  -webkit-transition-delay: .1s;
  transition-delay: .1s;
}
.open #global-nav ul li:nth-child(2) {
  -webkit-transition-delay: .2s;
  transition-delay: .2s;
}
.open #global-nav ul li:nth-child(3) {
  -webkit-transition-delay: .3s;
  transition-delay: .3s;
}
.open #global-nav ul li:nth-child(4) {
  -webkit-transition-delay: .4s;
  transition-delay: .4s;
}
.open #global-nav ul li:nth-child(5) {
  -webkit-transition-delay: .5s;
  transition-delay: .5s;
}

/* ***********************************************************
* #nav-bg
* *********************************************************** */
#nav-bg {
  content: "";
  width: 2400px;
  height: 2400px;
  margin-right: -1200px;
  margin-top: -1200px;
  top: 40px;
  right: 40px;
  display: block;
  position: fixed;
  background: #17A669;
  -webkit-border-radius: 50%;
  border-radius: 50%;
  -webkit-transition: all .3s ease-out;
  transition: all .3s ease-out;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transform: scale(.02);
  transform: scale(.02);

}
.open #nav-bg {
  -webkit-transform: scale(1);
  transform: scale(1);
  -webkit-transition: all .6s ease-out;
  transition: all .6s ease-out;
}

/* ***********************************************************
* #nav-toggle
* *********************************************************** */
#nav-toggle {
  display: block;
  position: fixed;
  right: 18px;
  top: 21px;
  width: 23px;
  height: 30px;
  cursor: pointer;
  padding: 10px 11px;
  z-index: 1001;
  -webkit-tap-highlight-color:rgba(0,0,0,0);
}

#nav-toggle div {
  position: relative;
}
#nav-toggle span {
  display: block;
  position: absolute;
  height: 2px;
  width: 100%;
  background: #fff;
  left: 0;
  zoom: 1;
  -webkit-transition: .35s ease-in-out;
  transition: .35s ease-in-out;
}

#nav-toggle span:nth-child(1) {
  top: 0;
}
#nav-toggle span:nth-child(2) {
  top: 8px;
}
#nav-toggle span:nth-child(3) {
  top: 16px;
}
.open #nav-toggle {
  background: transparent;
}
.open #nav-toggle span {
  background: #fff;
}

.open #nav-toggle span:nth-child(1) {
  top: 9px;
  -webkit-transform: rotate(-135deg);
  transform: rotate(-135deg);
  zoom: 1;
}
.open #nav-toggle span:nth-child(2) {
  width: 0;
  left: 50%;
}
.open #nav-toggle span:nth-child(3) {
  top: 9px;
  -webkit-transform: rotate(135deg);
  transform: rotate(135deg);
  zoom: 1;
}