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HTML

              
                #stuff
    .cloud
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
    .drop
              
            
!

CSS

              
                @import compass

html,body
  background: #ACBDC3
  overflow: hidden

.drop
  background: white
  width: 6px
  height: 6px
  border-radius: 12px
  right: 210px
  animation: fall 3s ease-in 0s infinite
  animation-fill-mode: both
  //margin-right: 45px
  position: absolute
  //animation-delay: 0.9s
  //margin-left: 10px
  &:nth-child(even)
    top: 10px
    left: -12px
    width: 8px
    height: 8px
    border-radius: 40px

    animation-delay: 1s !important
  &:nth-child(3n - 1)
    top: 0px
    left: 20px

      animation-delay: 2s !important
  &:nth-child(3n + 1)
    left: 0px
    top: -10px

    animation-delay: 3s !important
  &:nth-child(4n - 1)
    left: 110px
    top: -30px

    animation-delay: 2.5s !important
  &:nth-child(4n + 1)
    left: 45px
    top: 15px

    animation-delay: 1.5s !important
  &:nth-child(5n - 1)
    left: 95px
    top: -40px

  &:nth-child(-5n + 1)
    left: 65px
    top: 10px

    animation-delay: 2.25s !important
  &:nth-child(6n + 1)
    left: 37px
    top: -65px

    animation-delay: 1.25s !important


  

    
#stuff
  position: absolute
  margin: auto
  top: 100px
  left: 0
  right: 0
  bottom: 0
  width: 200px

.cloud
  height: 120px
  width: 120px
  border-radius:  150px 150px 0px 0px
  // animation: float 0.5s ease-in 0s infinite
  position: relative
  &, &:before, &:after
    box-shadow: inset 20px 10px 40px -32px rgba(0,0,0,0.75)
    background: #fff
  &:before, &:after
    content: ' '
    display: block
    position: absolute
    bottom: 0px
  &:before
    height: 70px
    width: 70px
    border-radius:  150px 150px 0px 150px
    left: -40px
  &:after
    height: 85px
    width: 85px
    border-radius:  150px 150px 150px 0px
    right: -55px
    z-index: -1
    
@keyframes fall
  0%
    margin-top: 90px
    opacity: 1
  60%
    opacity: 1
    margin-left: 45px
  100%
    margin-top: 400px
    opacity: 0
  
@keyframes float
  0%
    left: 0.5%
  50%
    left: -0.5%
  100%
    left: 0.5%
              
            
!

JS

              
                
              
            
!
999px

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