=ellipsis_vertical($font-size, $line-height,$lines-to-show)
  display: block
  display: -webkit-box
  height: $font-size*$line-height*$lines-to-show
  margin: 0 auto
  font-size: $font-size
  line-height: $line-height
  -webkit-line-clamp: $lines-to-show
  -webkit-box-orient: vertical
  overflow: hidden
  text-overflow: ellipsis