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@white: #ffffff;
@black: #000000;
@blue: rgb(51, 182, 219);
@blueOpaque: rgba(51, 182, 219, 0.9);

html, body { height: 100%; font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; 
   font-weight: 300; }
body {
  background-image: url(https://farm3.staticflickr.com/2844/12137587574_772edc9200_k.jpg);
  background-size: cover;
  background-repeat: no-repeat;
}
a {
  color: inherit;
  text-decoration: none;
  
  &:visited {
    color: inherit;
  }
}
.menu-button-target {
  cursor: pointer;
	position: absolute;
  z-index: 200;
	right: 60px;
	top: 60px;
	height: 50px;
  background-color: @blue;
  padding: 0 10px;
  transition: all 0.2s;
  
  &.active {
    background-color: transparent;
    
    .menu-button {
      background-color: transparent;
    
      &:before {
        transform: translateY(0%) rotate(45deg);
        background-color: @white;
      }
    
      &:after {
        transform: translateY(0%) rotate(-45deg);
        background-color: @white;
      }
    }
  }
}

.menu-button {
    position: relative;
		top: 50%;
		left: 0;
		display: block;
		width: 60px;
		height: 4px;
		margin-top: -2px;
		background-color: @white;
    transition: all 0.2s;
  
  &:before,
  &:after {
    content: "";
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    background-color: @white;
    transition: all 0.2s;
  }
  
  &:before {
    transform: translateY(-250%);
  }
  &:after {
    transform: translateY(250%);
  }
}
.menu-overlay {
  width: 100%;
  height: 100%;
  background-color: @blueOpaque;
  display: none;
  
  &.active {
    nav ul {
      margin-top: 200px;
    }
  }
}
nav {
  overflow: hidden;
  ul {
    overflow: hidden;
    margin-top: 0;
    transition: margin-top 0.4s ease;
    li {
      width: 100%;
      text-align: center;
      color: @white;
      padding: 20px 0;
      font-size: 50px;
      transition: background-color 0.4s, color 0.2s;
      
      &:hover {
        background-color: @white;
        color: @blue;
      }
    }
  }
} 

var $menuTrigger = $('[data-ic-class="button-trigger"]'),
    $menuOverlay = $('[data-ic-class="overlay"]'),
    $menuItem = $('.menu-item'),
    activeClass = 'active';

$menuTrigger.click(function(){
  $menuTrigger.toggleClass(activeClass);
  $menuOverlay.fadeToggle(400).toggleClass(activeClass);
});
$menuItem.click(function(){
  $menuTrigger.toggleClass(activeClass);
  $menuOverlay.fadeToggle(400).toggleClass(activeClass);
});

<div class="menu-button-target" data-ic-class="button-trigger">
  <span class="menu-button"></span>
</div>
<div class="menu-overlay" data-ic-class="overlay">
  <nav role='navigation'>
    <ul>
      <li class="menu-item"><a href="#">Home</a></li>
      <li class="menu-item"><a href="#">About</a></li>
      <li class="menu-item"><a href="#">Clients</a></li>
      <li class="menu-item"><a href="#">Contact Us</a></li>
    </ul>
  </nav>  
</div>