Material Inspired Animated Dropdown Menu

A Material Design inspired animated dropdown menu that uses CSS3 transitions & transforms for menu open / close animations.

How to use it:

Create a dropdown menu with a close link into your navigation menu.

<ul class="nav">
  <li><a href="#">Home</a></li>
  <li><a href="#">Works</a></li>
  <li><a href="#">Services</a></li>
  <div class="material-dropdown">
    <figure></figure>
    <figure class="middle"></figure>
    <p class="cross">x</p>
    <figure></figure>
    <ul class="dropdown">
      <li><a href="#">Blog</a></li>
      <li><a href="#">Contact</a></li>
      <li><a href="#">About</a></li>
      <li><a href="#">Social Media</a></li>
    </ul>
  </div>
</ul>

The Core CSS / CSS3 style rules for the dropdown menu.

.nav { margin-left: 20%; }
.nav > li {
  display: inline-block;
  padding: 1em 18px;
  cursor: pointer;
}
.nav > li:hover { background: #ebebeb; }
.dropdown {
  position: absolute;
  right: 0;
  top: 3em;
  transition: all 0.25s ease-out;
  transform: scale(0);
  transform-origin: 100% 0;
  box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.16), 0 2px 8px 0 rgba(0, 0, 0, 0.12);
}
.dropdown li {
  display: block;
  width: 100%;
}
.dropdown li a {
  width: 100%;
  padding: 1em 18px;
  display: inline-block;
  white-space: pre;
  box-sizing: border-box;
}
.dropdown li a:hover { background: #ebebeb; }
.dropdown:hover ul { transform: scale(1); }
.dropdown.active {
  transform: scale(1);
  transition: all 0.25s cubic-bezier(0.5, 1.8, 0.9, 0.8);
}

Style the hamburger button that will morph into a close button for the dropdown menu.

.middle {
  transition: all 0.25s cubic-bezier(0.72, 1.2, 0.71, 0.72);
  transform: scale(1);
  position: relative;
  box-shadow: 0 0.1px 0.1px 0 rgba(0, 0, 0, 0.16), 0 0.1px 0.3px 0 rgba(0, 0, 0, 0.12);
  -webkit-filter: blur(0.1px);
  filter: blur(0.1px);
}
.middle.active {
  transform: scale(4.5);
  transition: all 0.25s cubic-bezier(0.32, 2.04, 0.85, 0.54);
  box-shadow: 0 0.1px 0.1px 0 rgba(0, 0, 0, 0.16), 0 0.1px 0.3px 0 rgba(0, 0, 0, 0.12);
}
.cross {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  margin-top: -1px;
  color: white;
  transition: all 0.2s cubic-bezier(0.72, 1.2, 0.71, 0.72);
  font-size: 22px;
  user-select: none;
}
.cross.active {
  transform: translate(-50%, -50%) scale(1);
  transition: all 0.15s cubic-bezier(0.32, 2.04, 0.85, 0.54);
}

A little JavaScript magic to active the dropdown menu.

var materialdropdown = document.querySelector('.material-dropdown'),
    middle = document.querySelector('.middle'),
    cross = document.querySelector('.cross'),
    dropdown = document.querySelector('.dropdown');
materialdropdown.addEventListener('click', function() {
  middle.classList.toggle('active');
  cross.classList.toggle('active');
  dropdown.classList.toggle('active');
})