Pure CSS Material Morphing Menu

A Material Design inspired morphing menu which uses CSS3 clip-path to reveal a navigation menu with a smooth transition effect.

How to use it:

Create the Material menu with a toggle icon on your webpage.

<nav>
  <div class="navicon">
    <div></div>
  </div>
  <a href="#">Menu Item 1</a>
  <a href="#">Menu Item 2</a>
  <a href="#">Menu Item 3</a>
  <a href="#">Menu Item 4</a>
  <a href="#">Menu Item 5</a>
</nav>

The core CSS / CSS3 rules for the navigation menu.

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);
}

Style and position the toggle icon.

.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; }