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ul.box
  position: relative
  z-index: 1 /* prevent shadows falling behind containers with backgrounds */
  overflow: hidden
  list-style: none
  margin: 0
  padding: 0
  li
    position: relative
    float: left
    width: 250px
    height: 150px
    padding: 0
    border: 1px solid #efefef
    margin: 0 30px 30px 0
    background: #fff
    -webkit-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.27), 0 0 40px rgba(0, 0, 0, 0.06) inset
    -moz-box-shadow: 0 1px 4px rgba(0, 0, 0, 0.27), 0 0 40px rgba(0, 0, 0, 0.06) inset
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.27), 0 0 40px rgba(0, 0, 0, 0.06) inset
    &:before,
    &:after
      content: ''
      z-index: -1
      position: absolute
      left: 10px
      bottom: 10px
      width: 70%
      max-width: 300px /* avoid rotation causing ugly appearance at large container widths */
      max-height: 100px
      height: 55%
      -webkit-box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3)
      -moz-box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3)
      box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3)
      -webkit-transform: skew(-15deg) rotate(-6deg)
      -moz-transform: skew(-15deg) rotate(-6deg)
      -ms-transform: skew(-15deg) rotate(-6deg)
      -o-transform: skew(-15deg) rotate(-6deg)
      transform: skew(-15deg) rotate(-6deg)
    &:after
      left: auto
      right: 10px
      -webkit-transform: skew(15deg) rotate(6deg)
      -moz-transform: skew(15deg) rotate(6deg)
      -ms-transform: skew(15deg) rotate(6deg)
      -o-transform: skew(15deg) rotate(6deg)
      transform: skew(15deg) rotate(6deg)