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HTML

            
              .circle
  .inner
    .full
    .semi-wrap
      .semi-r.yellow.appear
      .semi-r.yellow
      .semi-t.red.appear
      .semi-t.red
      .semi-t
!

CSS

            
              @import "compass/css3";


// Variables
$blue   : #2552d9;
$green  : #1f9343; 
$red    : #d7282a; 
$yellow : #fcd800; 
$duration : 2s;
$edge-size : 150px;

body{
  background: #f7f7ee;
}

.circle{  
  width: $edge-size;
  height:$edge-size;
  
  position: absolute;
  top: 40%; left: 50%;
  margin-top: -75px;
  margin-left: -75px;
  @include box-shadow(1px 1px 20px #666);
  @include border-radius(100px);  
}

.inner{
  position: relative;
  width: 100%;
  height: 100%;
  
  .full{
    background: $green;
    width: 100%;
    height: 100%;
    border-radius: 100%;
    z-index: 1;
  }
  
  .semi-wrap{
    height: 100%;
    width: 100%;
    position: absolute; top: 0; left: 0;
    z-index: 10;
    
    .semi-t{
      position: absolute; top: 0; left: 0;
      background: $blue;
      width: 100%;
      height: 50%;
      @include border-radius(100px 100px 0 0px);
      @include transform-origin(100%, 100%);
      -webkit-animation: fold-up $duration infinite;
      
      &.red{
        opacity: 0;
        background: $red;
        -webkit-animation: fold-down $duration infinite;
      }
      
      &.red.appear{
        opacity: 0;
        background: $red;
        -webkit-animation: top-appear $duration infinite;
      }
    }

    .semi-r{
      position: absolute; top: 0; right: 0;
      background: $blue;
      width: 50%;
      height: 100%;
      @include border-radius(0 100px 100px 0);
      @include transform-origin(0%, 0%);
      z-index: 30;
      
      &.yellow{
        background: $yellow - 30;
        -webkit-animation: fold-left $duration infinite;
      }
      
      &.yellow.appear{
        opacity: 0;
        background: $yellow;
        -webkit-animation: right-appear $duration infinite;
      }
    }    
 
    
  }
}


// Animations

@-webkit-keyframes fold-up{
  0%        { @include transform( rotateX(180deg) ) }
  25%       { @include transform( rotateX(0deg) ); opacity: 1 }
  26%       { opacity: 0 }
  100%      { opacity: 0; }
}

@-webkit-keyframes fold-down{
  0%, 25%   { @include transform( rotateX(0deg) ); opacity: 0 }
  26%       { opacity: 1; background: $red - 500 }
  50%       { @include transform( rotateX(180deg) ); opacity: 1; background: $red; }
  100%      { @include transform( rotateX(180deg) ); opacity: 1 }
}

@-webkit-keyframes top-appear{
  0%, 25%   { opacity: 0 }
  26%       { opacity: 1 }
  100%      { opacity: 1 }
}

@-webkit-keyframes fold-left{
  0%, 50%   { opacity: 0 }
  51%       { @include transform( rotateY(0deg) ); background: $yellow - 100; opacity: 1 }
  100%      { @include transform( rotateY(180deg) ); background: $yellow; opacity: 1 }
}

@-webkit-keyframes right-appear{
  0%, 50%   { opacity: 0 }
  51%       { opacity: 1 }
  100%      { opacity: 1 }
}
!

JS

            
              /* 

   +-+-+-+-+-+-+ +-+-+        
   |L|o|a|d|e|r| |i|n|        
   +-+-+-+-+-+-+-+-+-+ +-+-+-+
   |G|m|a|i|l| |i|O|S| |A|p|p|
   +-+-+-+-+-+ +-+-+-+ +-+-+-+    

    Follow me on twitter:
    @brianmgonzalez

*/
!
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