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CSS

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HTML

              
                <div id="byebyecube"></div>
              
            
!

CSS

              
                black(alpha)
  rgba(0,0,0,alpha)

@keyframes cube-drop
  20%
    transform: translateY(0) translateZ(-1px)
  80%,
  100%
    transform: translateY(153px) translateZ(-1px)

@keyframes cube-shadow
  0%,
  20%
    transform: translateY(0) rotate(-30deg) skew(30deg)
    box-shadow: -50px 45px 10px -10px black(.3)
  37%
    box-shadow: -2px 2px 2px black(.5)
  37%,
  100%
    transform: translateY(42px) rotate(-30deg) skew(30deg)
  39%,
  100%
    box-shadow: -2px 2px 1px black(0)

#byebyecube
  width: 300px
  height: 400px
  position: relative
  left: 50%
  top: 0
  margin-left: -(@width/2)
  background-image: linear-gradient( 30deg, #aaa 30%, rgba(170, 170, 170,0) 30.1%),
                    linear-gradient(-30deg, #aaa 30%, rgba(170, 170, 170,0) 30.1%)
  transform-style: preserve-3d

  &:before, &:after
    display: block
    content: ''
    position: absolute

  &:before
    width: 200px
    height: 280px
    left: 50px
    top: -8px
    background-repeat: no-repeat
    background-image: linear-gradient( 30deg, transparent 26%, #ccc 26.3%, #ccc 74%, transparent 74.3%),
                      linear-gradient(150deg, transparent 26%, #999 26.3%, #999 74%, transparent 74.3%),
                      linear-gradient(150deg, transparent 26%, #eee 26.3%, #eee 73%, transparent 73%),
                      linear-gradient( 30deg, transparent 27%, #eee 27%, #eee 74%, transparent 74.3%),
                      radial-gradient(circle at center, #eee 20%, transparent 20%)
    background-size: 50% 60%
    background-position: 0 100%,
                         100% 100%,
                         0 48.5%,
                         100% 48.5%,
                         50% 60%
    animation: cube-drop 6000ms infinite alternate linear
    z-index: -1

  &:after
    width: 113px
    height: 100px
    left: 92px
    top: 164px
    z-index: 0
    animation: cube-shadow 6000ms infinite alternate linear

html
  height: 100vh
  display: flex
  align-items: center
  justify-content: center
  overflow: auto
  background-color: #aaa
    
body
  width: 100%
  z-index: 1
  overflow: hidden
  height: 400px
  background-color: #aaa
              
            
!

JS

              
                
              
            
!
999px

Console