Material Design Inspired Morphing Menu with CSS3 Transitions

A creative pure CSS navigation system that expands to a drop-down menu list with subtle CSS3 transitions when hovered, inspired by Google Material Design.

How to use it:

Create a regular navigation with a menu icon and a list of menu items.

<nav>
  <div class="navicon">
    <div></div>
  </div>
  
  <a>Home</a>
  <a>Categories</a>
  <a>Recommended</a>
  <a>Blog</a>
  <a>Contact</a>
  
</nav>

Animated the navigation using CSS3 transitions.

nav {
  width: 300px;
  background: white;
  color: rgba(0, 0, 0, 0.87);
  -webkit-clip-path: circle(24px at 30px 24px);
  clip-path: circle(24px at 32px 24px);
  -webkit-transition: -webkit-clip-path 0.5625s, clip-path 0.375s;
  transition: -webkit-clip-path 0.5625s, clip-path 0.375s;
}
nav:hover {
  -webkit-transition-timing-function: ease-out;
  transition-timing-function: ease-out;
  -webkit-transition-duration: 0.75s;
  transition-duration: 0.75s;
  -webkit-clip-path: circle(390px at 225px 24px);
  clip-path: circle(390px at 150px 24px);
}
a {
  display: block;
  line-height: 50px;
  padding: 0 20px;
  color: inherit;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
a:hover { background: #ffe082; }
a:active { background: #ffca28; }
.navicon {
  padding: 23px 20px;
  cursor: pointer;
  -webkit-transform-origin: 32px 24px;
  -ms-transform-origin: 32px 24px;
  transform-origin: 32px 24px;
}
.navicon div {
  position: relative;
  width: 20px;
  height: 2px;
  background: rgba(0, 0, 0, 0.87);
}
.navicon div:before,
.navicon div:after {
  display: block;
  content: "";
  width: 20px;
  height: 2px;
  background: rgba(0, 0, 0, 0.87);
  position: absolute;
}
.navicon div:before { top: -7px; }
.navicon div:after { top: 7px; }