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              label for="radius" Show radius?
input type="checkbox" id="radius"
#vcent
  - for i in 1..60
    div
            
          
!
            
              @import compass

@import "compass/layout"

$divs: 60
$diameter: 60px
$overlap-factor: 2.4  // lower = more overlap
$side: 24px
$columns: 12
$rows: $divs / $columns
$fade: 4s

$yellow: #f1c40f

html
  padding: 24px 36px
  background: #111

label, input
  cursor: pointer
  float: right
  
label
  margin-left: 12px
  font: bold italic 16px sans-serif
  color: #333

#vcent
  +stretch(0)
  height: $diameter * (1 + ($overlap-factor - 1) * $rows) / $overlap-factor
  width: $diameter * (1 + ($overlap-factor - 1) * $columns) / $overlap-factor
  margin: auto
  font-size: 0
  
  div
    $margin-overlap: -$diameter / $overlap-factor
      
    box-sizing: border-box
    position: relative
    display: inline-block
    height: $diameter
    width: $diameter
    margin: 0 $margin-overlap $margin-overlap 0
    +border-radius($diameter / 2)
    
    &:after
      $pos: ($diameter - $side - 2) / 2 // -2px for border
        
      content: ''
      position: absolute
      top: $pos
      left: $pos
      height: $side
      width: $side
      background: black
      +transition(background $fade, z-index 0s 1s)
        
    &:hover
      pointer-events: none
      z-index: -1 // backup incase pointer-events doesn't work
      
      &:after
        background: $yellow
        +transition(background 0s, z-index 0s)
        
\:checked + #vcent div
  border: 1px solid $yellow
  +transition(background $fade)
  
  &:after
    display: none
  
  &:hover
    background-color: $yellow
    +transition(background 0s)
            
          
!
999px
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