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HTML

              
                <button>Click Me</button>
              
            
!

CSS

              
                $clr = #99ff22
shadow(b1, b2, b3, b4, b5)
  -webkit-box-shadow b1, b2, b3, b4, b5
  -moz-box-shadow b1, b2, b3, b4, b5
  -ms-box-shadow b1, b2, b3, b4, b5
  -o-box-shadow b1, b2, b3, b4, b5
  box-shadow b1, b2, b3, b4, b5
transition(t)
  -webkit-transition all t
  -moz-transition all t
  -ms-transition all t
  -o-transition all t
  transition all t
radius(r)
  -webkit-border-radius r
  -moz-border-radius r
  -ms-border-radius r
  -o-border-radius r
  border-radius r
body
  background white
button
  position absolute
  top 50%
  left 50%
  display block
  width 200px
  height 60px
  margin -30px -100px
  border 0
  outline 0
  radius 10px
  background $clr
  transition 0.2s
  shadow inset 0 -28px 28px darken($clr, 8%), 0 0 2px 2px darken($clr, 30%), 0 0 0 10px lighten($clr, 30%), 0 0 0 12px lighten($clr, 60%), 0 0 0 15px darken($clr, 60%)
  text-transform uppercase
  font-size 1.8em
  font-weight 700
  text-shadow 0 0 2px darken($clr, 90%)
  color darken($clr, 70%)
  cursor pointer
  &:after, &:before
    position absolute
    top 12px
    height 20px
    width 20px
    display block
    content '\25c6'
  &:after
    right 6px
  &:before
    left 2px
  &:hover
    background saturate($clr, 70%)
    shadow inset 0 -28px 28px lighten(saturate($clr, 70%), 15%), 0 0 4px 4px darken(saturate($clr, 70%), 30%), 0 0 0 8px lighten(saturate($clr, 70%), 80%), 0 0 0 2px lighten(saturate($clr, 70%), 90%), 0 0 0 10px lighten(saturate($clr, 70%), 20%)
  &:active
    color invert($clr)
    background lighten(invert($clr), 50%)
    shadow inset 0 -28px 28px lighten(invert($clr), 60%), 0 0 0px 0px invert($clr), 0 0 0 0px invert($clr), 0 0 0 0px invert($clr), 0 0 0 0px invert($clr)
              
            
!

JS

              
                
              
            
!
999px

Console