CSS Animated Hamburger Icon - Sass

css-animated-hamburger-icon-sass.markdown

License.

index.html

<div class="entire-menu">
  <input type="checkbox" id="change-hamburguer" />
  <a class="hamburguer" href="#">
    <span></span>
    <label for="change-hamburguer"></label>
  </a>
  <div class="menu">
    <a href="#">Item</a>
    <a href="#">Item</a>
    <a href="#">Item</a>
    <a href="#">Item</a>
    <a href="#">Item</a>
    <p><a href="#">Item</a></p>
  </div>
</div>

style.scss

$button-size: 20px;
$button-color: #000;

@function calc-line-height($n) {
  @return $n / 5;
}

@mixin css3-rotation($n){
  -ms-transform:rotate($n);
  -webkit-transform:rotate($n);
  transform: rotate($n);
}

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body{
  background: url(http://www.tutsup.com/wp-content/uploads/2014/07/01.png) no-repeat;
  background-size: cover;
}
.entire-menu{
  position: absolute;
  padding: 20px;
  width: 100%;
}
.hamburguer{
  width: $button-size;
  height: $button-size;
  display: block;
  position: relative;
  background: none;
  margin: 0 0 10px 0;
  
  &:after, &:before, span, label{
    content: ' ';
    display: block;
    width: 100%;
    height: calc-line-height( $button-size );
    background: $button-color;
    left:0;
    position: absolute;
    -webkit-transition: all 300ms ease-in-out; 
    transition: all 300ms ease-in-out;
  }
  &:before{
    top: 0;
  }
  &:after{
    bottom: 0; 
  }
  &:focus{
    outline: none;
  }
  label{
    width: 100%;
    height: 100%;
    background: none;
    cursor: pointer;
    z-index: 1000;
  }
  span{
    top: calc-line-height( $button-size ) * 2;
  }
}

#change-hamburguer{
  display:none;
  
  &:checked ~ .hamburguer:before, &:checked ~ .hamburguer:after {
    top: $button-size / 2;
    margin-top: -10%;
  }
  &:checked ~ .hamburguer:before{
		@include css3-rotation(-45deg);
  }
  &:checked ~ .hamburguer:after{
		@include css3-rotation(45deg);
  }
  &:checked ~ .hamburguer span{
		opacity: 0;
  }
  &:checked ~ .menu{
    max-height: 200px;
  }
}
.menu{
  max-height: 0;
  height: auto;
  background: #000;
  -webkit-transition: all 300ms ease-in-out; 
  transition: all 300ms ease-in-out;
  overflow: hidden;
  font-family: sans-serif;
  font-weight: 400;
  font-size: 13px ;
  width: 50%;
  
  a {
  	text-decoration: none;
    color: #fff;
    padding: 5px 10px;
    display: block;
    text-transform: uppercase;
    border-left: 5px solid #000;
    
    &:hover{
      border-left: 5px solid #e57373;
      color: #e57373;
      background: #222;
    }
  }

}