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              body
  background: #000
  
.arrow,
.arrow:before
  position: absolute
  left: 50%

.arrow
  width: 40px
  height: 40px
  top: 50%
  margin: -20px 0 0 -20px
  -webkit-transform: rotate(45deg)
  border-left: none
  border-top: none
  border-right: 2px #fff solid
  border-bottom: 2px #fff solid

  
.arrow:before
  content: ''
  width: 20px
  height: 20px
  top: 50%
  margin: -10px 0 0 -10px
  border-left: none
  border-top: none
  border-right: 1px #fff solid
  border-bottom: 1px #fff solid
  animation-duration: 2s
  animation-iteration-count: infinite
  animation-name: arrow
  
@keyframes arrow
  0%
    opacity: 1
  100%
    opacity: 0
    transform: translate(-10px, -10px)

  
  
  
  
            
          
!
999px
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