Hamburger button with css

by Pranab Dey

HTML

<nav role="navigation">
  <div id="menuToggle">
    <input type="checkbox" />
    <span></span>
    <span></span>
    <span></span>
    <ul id="menu">
      <a href="#"><li>Home</li></a>
      <a href="#"><li>About</li></a>
      <a href="#"><li>Contact</li></a>
    </ul>
  </div>
</nav>

CSS

body
{
  margin: 0;
  padding: 0;
  background: #232323;
  color: #cdcdcd;
}

a
{
  text-decoration: none;
  color: #232323;
  transition: color 0.3s ease;
}

a:hover
{
  color: tomato;
}

#menuToggle
{
  display: block;
  position: relative;
  top: 50px;
  left: 50px;
  
  z-index: 1;
}

#menuToggle input
{
  display: block;
  width: 40px;
  height: 32px;
  position: absolute;
  top: -7px;
  left: -5px;
  cursor: pointer;
  
  opacity: 0;
  z-index: 2;
}
#menuToggle span
{
  display: block;
  width: 33px;
  height: 4px;
  margin-bottom: 5px;
  position: relative;
  
  background: #cdcdcd;
  border-radius: 3px;
  
  z-index: 1;
  
  transform-origin: 4px 0px;
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
              background 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
              opacity 0.55s ease;
}

#menuToggle span:first-child
{
  transform-origin: 0% 0%;
}

#menuToggle span:nth-last-child(2)
{
  transform-origin: 0% 100%;
}
#menuToggle input:checked ~ span
{
  opacity: 1;
  transform: rotate(45deg) translate(-2px, -1px);
  background: #232323;
}
#menuToggle input:checked ~ span:nth-last-child(3)
{
  opacity: 0;
  transform: rotate(0deg) scale(0.2, 0.2);
}

#menuToggle input:checked ~ span:nth-last-child(2)
{
  transform: rotate(-45deg) translate(0, -1px);
}

#menu
{
  position: absolute;
  width: 300px;
  margin: -100px 0 0 -50px;
  padding: 50px;
  padding-top: 125px;
  
  background: #ededed;
  list-style-type: none;
  
  transform-origin: 0% 0%;
  transform: translate(-100%, 0);
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0);
}

#menu li
{
  padding: 10px 0;
  font-size: 22px;
}
#menuToggle input:checked ~ ul
{
  transform: none;
}