Fullscreen Overlay Navigation with Velocity.js and CSS3

Preview:

Description:

A fullscreen site navigation with a hamburger toggle button and a cool transition effect implemented with jQuery, Velocity.js, CSS3 flexbox model and several animation properties.

How to use it:

Create the fullscreen overlay navigation with the following html structure.

<div class="overlay-navigation">
  <nav role="navigation">
    <ul>
      <li><a href="#" data-content="The beginning">Home</a></li>
      <li><a href="#" data-content="Curious?">About</a></li>
      <li><a href="#" data-content="I got game">Skills</a></li>
      <li><a href="#" data-content="Only the finest">Works</a></li>
      <li><a href="#" data-content="Don't hesitate">Contact</a></li>
    </ul>
  </nav>
</div>

The CSS for the fullscreen navigation.

.overlay-navigation {
  position: fixed;
  z-index: 99;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: hsla(0, 0%, 100%, 0.2);
  display: none;
  opacity: 0;
}
nav, nav ul {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}
nav ul {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  list-style: none;
}
nav ul li {
  -webkit-flex-basis: 20%;
  -ms-flex-preferred-size: 20%;
  flex-basis: 20%;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  height: 100%;
  overflow: hidden;
  opacity: 0;
  display: none;
}
nav li a {
  position: relative;
  top: 46%;
  color: #fff;
  text-transform: uppercase;
  font-family: 'Work sans', sans-serif;
  font-weight: 300;
  letter-spacing: 4px;
  text-decoration: none;
  display: block;
  text-align: center;
  font-size: 0.9rem;
  opacity: 0;
}
nav li a:before {
  content: '';
  width: 70px;
  height: 2px;
  background-color: #fff;
  position: absolute;
  top: 50%;
  left: 0;
  z-index: 100;
  -webkit-transform: translateX(-100%);
  -ms-transform: translateX(-100%);
  transform: translateX(-100%);
  opacity: 0;
  -webkit-transition: all .2s linear;
  transition: all .2s linear;
}
nav li a:after {
  content: attr(data-content);
  font-size: 0.7rem;
  -webkit-transition: all .2s linear;
  transition: all .2s linear;
  opacity: 0;
  position: absolute;
  z-index: 100;
  color: #fff;
  display: block;
  margin-right: auto;
  margin-left: auto;
  left: 0;
  right: 0;
  bottom: -50px;
  text-transform: none;
  font-family: 'Open sans', serif;
  font-weight: 300;
  font-style: italic;
  letter-spacing: 0;
}
nav li a:hover:before {
  -webkit-transform: translateX(0);
  -ms-transform: translateX(0);
  transform: translateX(0);
  opacity: 1;
}
nav li a:hover:after {
  -webkit-transform: translateY(15px);
  -ms-transform: translateY(15px);
  transform: translateY(15px);
  opacity: 1;
}
nav li:nth-of-type(1) { background-color: #29363B }
nav li:nth-of-type(2) { background-color: #EA495F }
nav li:nth-of-type(3) { background-color: #F4837D }
nav li:nth-of-type(4) { background-color: #FDCEA9 }
nav li:nth-of-type(5) { background-color: #99B998 }

Create a trigger button which allows you to toggle the fullscreen navigation.

<section class="home">
  <div class="open-overlay">
    <span class="bar-top"></span> 
    <span class="bar-middle"></span> 
    <span class="bar-bottom"></span> 
  </div>
</section>

The CSS for the trigger button.

.open-overlay {
  position: absolute;
  right: 5rem;
  top: 3.2rem;
  z-index: 100;
  width: 34px;
  display: block;
  cursor: pointer;
}
.open-overlay span {
  display: block;
  height: 1px;
  background-color: #fff;
  cursor: pointer;
  margin-top: 8px;
}
.animate-top-bar {
  -webkit-animation: animate-top-bar .6s linear 1 both;
  animation: animate-top-bar .6s linear 1 both
}
.animate-bottom-bar {
  -webkit-animation: animate-bottom-bar .6s linear 1 both;
  animation: animate-bottom-bar .6s linear 1 both
}
.animate-middle-bar {
  -webkit-animation: animate-middle-bar .6s linear 1 both;
  animation: animate-middle-bar .6s linear 1 both
}
.animate-out-top-bar {
  -webkit-animation: animate-out-top-bar .6s linear 1 both;
  animation: animate-out-top-bar .6s linear 1 both
}
.animate-out-bottom-bar {
  -webkit-animation: animate-out-bottom-bar .6s linear 1 both;
  animation: animate-out-bottom-bar .6s linear 1 both
}
.animate-out-middle-bar {
  -webkit-animation: animate-out-middle-bar .6s linear 1 both;
  animation: animate-out-middle-bar .6s linear 1 both
}

The Animation keyframes.

@keyframes 
animate-top-bar {  0% {
 background-color: #fff;
}
 50% {
 -webkit-transform: translateY(9px);
 transform: translateY(9px)
}
 80% {
 -webkit-transform: translateY(5px);
 transform: translateY(5px);
 background-color: #fff
}
 100% {
 -webkit-transform: translateY(0);
 transform: translateY(0);
 background-color: #29363B;
}
}
@keyframes 
animate-bottom-bar {  0% {
 background-color: #fff;
}
 50% {
 -webkit-transform: translateY(-9px);
 transform: translateY(-9px)
}
 80% {
 -webkit-transform: translateY(-5px);
 transform: translateY(-5px);
 background-color: #fff;
}
 100% {
 -webkit-transform: translateY(0);
 transform: translateY(0);
 background-color: #29363B;
}
}
@keyframes 
animate-middle-bar {  0% {
 background-color: #fff;
}
 80% {
 background-color: #fff;
}
 100% {
 background-color: #29363B;
}
}
@keyframes 
animate-out-top-bar {  0% {
 background-color: #29363B
}
 50% {
 -webkit-transform: translateY(9px);
 transform: translateY(9px)
}
 80% {
 -webkit-transform: translateY(5px);
 transform: translateY(5px);
 background-color: #29363B
}
 100% {
 -webkit-transform: translateY(0);
 transform: translateY(0);
 background-color: #FFF;
}
}
@keyframes 
animate-out-bottom-bar {  0% {
 background-color: #29363B
}
 50% {
 -webkit-transform: translateY(-9px);
 transform: translateY(-9px)
}
 80% {
 -webkit-transform: translateY(-5px);
 transform: translateY(-5px);
 background-color: #29363B;
}
 100% {
 -webkit-transform: translateY(0);
 transform: translateY(0);
 background-color: #FFF;
}
}
@keyframes 
animate-out-middle-bar {  0% {
 background-color: #29363B
}
 80% {
 background-color: #29363B;
}
 100% {
 background-color: #fff;
}
}

Place the jQuery and Velocity.js JavaScript libraries at the bottom of your webpage.

<script src="jquery.min.js"></script>
<script src="jquery.velocity.min.js"></script>
<script src="velocity.ui.js"></script>

The core JavaScript to active the fullscreen navigation.

$('.open-overlay').click(function() {
 $('.open-overlay').css('pointer-events', 'none');
 var overlay_navigation = $('.overlay-navigation'),
   top_bar = $('.bar-top'),
   middle_bar = $('.bar-middle'),
   bottom_bar = $('.bar-bottom');
 overlay_navigation.toggleClass('overlay-active');
 if (overlay_navigation.hasClass('overlay-active')) {
   top_bar.removeClass('animate-out-top-bar').addClass('animate-top-bar');
   middle_bar.removeClass('animate-out-middle-bar').addClass('animate-middle-bar');
   bottom_bar.removeClass('animate-out-bottom-bar').addClass('animate-bottom-bar');
   overlay_navigation.removeClass('overlay-slide-up').addClass('overlay-slide-down')
   overlay_navigation.velocity('transition.slideLeftIn', {
     duration: 300,
     delay: 0,
     begin: function() {
       $('nav ul li').velocity('transition.perspectiveLeftIn', {
         stagger: 150,
         delay: 0,
         complete: function() {
           $('nav ul li a').velocity({
             opacity: [1, 0],
           }, {
             delay: 10,
             duration: 140
           });
           $('.open-overlay').css('pointer-events', 'auto');
         }
       })
     }
   })
 } else {
   $('.open-overlay').css('pointer-events', 'none');
   top_bar.removeClass('animate-top-bar').addClass('animate-out-top-bar');
   middle_bar.removeClass('animate-middle-bar').addClass('animate-out-middle-bar');
   bottom_bar.removeClass('animate-bottom-bar').addClass('animate-out-bottom-bar');
   overlay_navigation.removeClass('overlay-slide-down').addClass('overlay-slide-up')
   $('nav ul li').velocity('transition.perspectiveRightOut', {
     stagger: 150,
     delay: 0,
     complete: function() {
       overlay_navigation.velocity('transition.fadeOut', {
         delay: 0,
         duration: 300,
         complete: function() {
           $('nav ul li a').velocity({
             opacity: [0, 1],
           }, {
             delay: 0,
             duration: 50
           });
           $('.open-overlay').css('pointer-events', 'auto');
         }
       });
     }
   })
 }
})