aspect-ratio.sass

/*
  layout-tools | aspect-ratio
  ============================== */

=aspect-ratio($ratio-or-width, $height: null)
  position: relative
  &:before
    content: ''
    float: left
    padding-bottom: if($height, percentage($height/$ratio-or-width), percentage(1/$ratio-or-width))
  &:after
    content: ''
    display: table
    clear: both
  > *
    position: absolute
    top: 0
    right: 0
    bottom: 0
    left: 0