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HTML

              
                #frame
#stage
  #box
    .in.one
  #box
    .in.two
  #box
    .in.thr
  #box
    .in.fou
              
            
!

CSS

              
                //Color
$clr1: #ABC7C9
$clr2: #F8F3E8
$clr3: darken($clr2,2%)
$clr4: #F3BCAA

//Mixin
=center
  position: absolute
  top: 50%
  left: 50%
  transform: translate(-50%, -50%)

//Container
#stage
  +center
  width: 350px
  height: 350px
  perspective: 800
#frame
  +center
  width: 350px
  height: 350px
  opacity: 0
  box-shadow: 0 0 40px rgba(0,0,0,0.06)
  animation: show 0.5s 3s ease forwards

//Folds
#box
  position: absolute
  width: 150px
  height: 150px
  background: $clr1
  border: 25px solid $clr2
  box-shadow: 0 0 40px rgba(0,0,0,0.07)
  overflow: hidden
  border-radius: 4px
  .in
    position: absolute
    width: 100px
    height: 100px
    border-radius: 50%
    background: rgba(darken($clr2,6%),0.6)
    animation: grow 0.5s 3s cubic-bezier(0.66,-0.30,0.66,1) forwards
    &.one
      left: 100px
      bottom: -50px
    &.two
      left: -50px
      bottom: -50px
    &.thr
      left: 100px
      bottom: 100px
    &.fou
      left: -50px
      bottom: 100px
  &:nth-child(1)
    background: $clr3
    border-radius: 5px 0 0 0
    border-right: none
    border-bottom: none
    animation: clr 1s 1s ease forwards
  &:nth-child(2)
    background: $clr3
    border-radius: 0 5px 0 0
    left: 175px
    border-left: none
    border-bottom: none
    transform-origin: 0 0
    transform: rotateY(180deg)
    animation: fold 1s 1s ease forwards
  &:nth-child(3)
    background: $clr3
    border-radius: 0 0 0 5px
    top: 175px
    width: 150px
    opacity: 0
    border-top: none
    border-right: none
    transform: rotateX(180deg)
    transform-origin: 0 0
    animation: fold2 1s 2s ease forwards
  &:nth-child(4)
    background: $clr3
    border-radius: 0 0 5px 0
    top: 175px
    left: 175px
    opacity: 0
    border-top: none
    border-left: none
    transform: rotateX(180deg)
    transform-origin: 0 0
    animation: fold2 1s 2s ease forwards
  
//Animation  
@keyframes clr
  99.99%
    background: $clr3
  100%
    background: $clr1

@keyframes fold
  99.99%
    background: $clr3
  100%
    background: $clr1
    transform: rotateY(360deg)

@keyframes fold2
  0%
    opacity: 1
    background: $clr3
  25%
    opacity: 1
    background: $clr3
  40%
    opacity: 1
    background: $clr1
  100%
    opacity: 1
    background: $clr1
    transform: rotateX(0deg)
  
@keyframes show
  100%
    opacity: 1
  
@keyframes grow
  100%
    width: 170px
    height: 170px
    border-radius: 10%
    left: -10px
    bottom: -10px
    background: rgba(darken($clr1,10%),0.8)

//
body
  background: #ccc
  overflow: hidden
              
            
!

JS

              
                
              
            
!
999px

Console