A Pen by Michael.

awGzf.markdown

awGzf

A Pen by Michael on CodePen.

License.

index.html

<div class="menu-icon">
  <span></span>
</div>

script.js

var button = document.querySelector('.menu-icon');
button.addEventListener('click', function (){
  button.classList.toggle('open');
});

style.css

/*
  menu icon css3
*/

.menu-icon {
  position: relative;
  display: block;
  width: 4em;
  height: 4em;
  cursor: pointer;
  /* to center */
  margin: 0 auto;
  float: none;
  -webkit-transition: all 0.3s;
	        transition: all 0.3s;
}

.menu-icon > span {
  position: absolute;
  top: 50%;
  display: block;
  width: 100%;
  height: 0.5em;
  margin-top: -0.5em;
  background-color: #e74c3c;
}

.menu-icon > span:before,
.menu-icon > span:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: #e74c3c;
  -webkit-transition: all 0.3s;
	        transition: all 0.3s;
}

.menu-icon > span:before {
  -webkit-transform: translateY(-1em);
	        transform: translateY(-1em);
}

.menu-icon > span:after {
  -webkit-transform: translateY(1em);
	        transform: translateY(1em);
}

/* OPENED */

.menu-icon.open {
  -webkit-transform: rotate(45deg);
	        transform: rotate(45deg);
}

.menu-icon.open > span:before {
  -webkit-transform: rotate(90deg);
	        transform: rotate(90deg);
}

.menu-icon.open > span:after {
  -webkit-transform: rotate(90deg);
	        transform: rotate(90deg);
}