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              <div class="rectangle">
  <div class="p1"></div>
  <div class="p2"></div>
  <div class="p3"></div>
  <div class="p4"></div>
</div>
            
          
!
            
              /*
Setup @keyframes sets to move the first three shapes (.p1, .p2, and .p3) in random orders and have the square shape (.p1) be the only shape left over.

Infinite Chocolate: http://youtu.be/liI7rm5o1Rc
*/

$bezier-shape: cubic-bezier(.4,.2,0,1);

html,body { height: 100%; }

body { perspective: 1000px; }

.rectangle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 400px;
  height: 614px;
  transform: translate3d(-50%,-50%,0);
  transform-style: preserve-3d;

  .p1 {
    position: absolute;
    background-color: brown;
    height: 100px;
    width: 100px;
    animation: p1Ani 3s 1s both $bezier-shape;
  }

  .p2 {
    position: absolute;
    height: 220px;
    width: 0;
    border-left: 300px solid brown;
    border-bottom: 71px solid transparent;
    animation: p2Ani 3s 1s both $bezier-shape;
  }

  .p3 {
    position: absolute;
    height: 191px;
    width: 0;
    border-left: 100px solid brown;
    border-bottom: 24px solid transparent;
    animation: p3Ani 3s 1s both $bezier-shape;
  }

  .p4 {
    position: absolute;
    height: 300px;
    width: 0;
    border-right: 400px solid brown;
    border-top: 95px solid transparent;
    transform: translate3d(0,219px,0);
  }
}

/* Adjust the transforms and keyframe sets below */
@keyframes p1Ani {
  from { transform: translate(0,0); }
  33% { transform: translate(0,0); }
  66% { transform: translate(0,0); }
  to { transform: translate(0,0); }
}

@keyframes p2Ani {
  from { transform: translate(100px,0); }
  33% { transform: translate(100px,0); }
  66% { transform: translate(100px,0); }
  to { transform: translate(100px,0); }
}

@keyframes p3Ani {
  from { transform: translate(0,100px); }
  33% { transform: translate(0,100px); }
  66% { transform: translate(0,100px); }
  to { transform: translate(0,100px); }
}
            
          
!
999px
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