<div class="wrapper">
  <div class="burger">
    <div class="one"></div>
    <div class="two"></div>
    <div class="three"></div>
  </div>

  <div class="circle"></div>
</div>

<a target="_blank" href="https://dribbble.com/shots/1623679-Open-Close">Inspired by Creativedash's Open & Close animation</a>

@import "compass/css3";

@import "compass/css3/transform";

@mixin transitions($time, $easing, $delay:0s) {
	-webkit-transition: all $time $easing $delay;
	   -moz-transition: all $time $easing $delay;
	    -ms-transition: all $time $easing $delay;
	     -o-transition: all $time $easing $delay;
	        transition: all $time $easing $delay;
}
       
@mixin animation($name, $time) {
  -webkit-animation: $name $time infinite;
     -moz-animation: $name $time infinite;
       -o-animation: $name $time infinite;
          animation: $name $time infinite;
  -webkit-animation-direction: alternate;
          animation-direction: alternate;
}
        
@mixin keyframes($name) {
  @-webkit-keyframes #{$name} {
    @content; 
  }
  @-moz-keyframes #{$name} {
    @content;
  }
  @-ms-keyframes #{$name} {
    @content;
  }
  @keyframes #{$name} {
    @content;
  } 
}
    
body {
  background: #31AA39; 
  text-align: center;
  margin: 0;
  padding: 0;
}

a {
  color: #fff;
  font-family: sans-serif;
  text-decoration: none;
  
  &:hover { border-bottom: 2px solid white; }
}

.wrapper {
  text-align: center;
  margin: 200px auto 50px auto;
}

.burger {
  height: 30px;
  width: 33px;
  cursor: pointer;
  margin: 0 auto;
  display: block;

  .one,
  .two,
  .three {
    margin-top: 3px;
    background: #fff;
    width: 33px;
    height: 4px;
    position: absolute;
    border-radius: 2px;
    @include transitions(0.2s, ease-in-out);
  }
      
  .one { 
    @include animation(layer-one, 2.3333s); 
  }

  .two { 
    margin-top: 13px; 
    @include transform-origin(33px,0);
    @include animation(layer-two, 2.3333s); 
  }
  
  .three { 
    margin-top: 23px;
    @include animation(layer-three, 2.3333s);
  }
}
            
// Animation for the top layer
@include keyframes(layer-one) {
  0% {
     @include simple-transform(1, 0deg, 0, 0);
  }
  26.5% {
     @include simple-transform(1, 0deg, 0, 0);
  }
  33% {
     @include simple-transform(1, 25deg, 0, 0);
  }
  40% {
     @include simple-transform(1, -60deg, 0, 14px);
  }
  60% {
     @include simple-transform(1, -45deg, 0, 14px);
  } 
  100% {
     @include simple-transform(1, -45deg, 0, 14px);
  } 
}

// Animation for the bottom layer
@include keyframes(layer-three) {
  0% {
    @include simple-transform(1, 0deg, 0, 0);
  }
  26.5% {
    @include simple-transform(1, 0deg, 0, 0);
  }
  33% {
    @include simple-transform(1, -25deg, 0, 0);
  }
  40% {
    @include simple-transform(1, 60deg, 0, -14px);
  }
  60% {
    @include simple-transform(1, 45deg, 0, -14px);
  } 
  100% {
    @include simple-transform(1, 45deg, 0, -14px);
  } 
}


// Animation for the middle layer
@include keyframes(layer-two) {
  0% {
		@include transform(translateX(0) scaleX(1));
  }
  26.5% {
		@include transform(translateX(0) scaleX(1));
  }
  33% {
		@include transform(translateX(-10px) scaleX(0.95));
  }
  36.5% {
		@include transform(translateX(28px) scaleX(1));
  }
  44% {
		@include transform(translateX(28px) scaleX(0));
  } 
  100% {
		@include transform(translateX(28px) scaleX(0));
  } 
}

// ----------
// CIRCLE
// ----------
.circle {
  width: 60px;
  height: 60px;
  border: 4px solid #fff;
  border-radius: 60px;
  display: block;
  position: absolute;
  left: 50%;
  margin-left: -25px;
  margin-top: -49px;
  @include transitions(0.2s, ease-in-out);
  @include animation(circle-anim, 2.3333s);
}


@include keyframes(circle-anim) {
  0% {
    @include transform(rotate(90deg));
    clip: rect(0px, 0px, 0px, 0px);
  }
  26.5% {
    @include transform(rotate(90deg));
    clip: rect(0px, 0px, 0px, 0px);
  }
  33% {
    @include transform(rotate(90deg));
    clip: rect(0px, 0px, 0px, 0px);
  }
  60% {
    @include transform(rotate(120deg));
    clip: rect(0px, 35px, 35px, 0px);
  }
  100% {
    @include transform(rotate(-360deg));
    clip: rect(auto, auto, auto, auto);
  } 
}