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HTML

              
                .upload.cntr
  i.cntr
              
            
!

CSS

              
                @import "nib"

$red = #E64D43
$blue = #2D3E4F

content-i()
  content ''
  position absolute
  display block

body
  background $blue
  
.cntr
  position absolute
  top 50%
  left 50%
  transform translate(-50%,-50%)
  
.upload
  display block
  width 40px
  height 50px
  border-radius 2px
  background $red
  cursor pointer
  &:after
    content-i()
    top 0px
    right 0px
    width 0px
    height 0px
    border-radius 0px 2px 0px 2px
    background linear-gradient(45deg, 50% darken($red,25%), 50% $blue)
    transition all .2s linear
  i
    width 2px
    height 14px
    background white
    display block
    border-radius 2px
    transition all 150ms linear
    &:before
    &:after
      content-i()
      width 2px
      height 8px
      background white
      border-radius 2px
      transition all 150ms linear
    &:before
      transform rotate(45deg) translateX(-3px)
    &:after
      transform rotate(-45deg) translateX(3px)
  &:hover
    i
      height 18px
    &:after
      width 12px
      height 12px
  
  
  
              
            
!

JS

              
                
              
            
!
999px

Console