$dimensions ?= 16 24 32 48 64 96 128

.image
  display block
  position relative
  img
    display block
    height auto
    width 100%
  // Ratio
  &.is-square,
  &.is-1by1,
  &.is-4by3,
  &.is-3by2,
  &.is-16by9,
  &.is-2by1
    img
      overlay()
      height 100%
      width 100%
  &.is-square,
  &.is-1by1
    padding-top 100%
  &.is-4by3
    padding-top 75%
  &.is-3by2
    padding-top 66.6666%
  &.is-16by9
    padding-top 56.25%
  &.is-2by1
    padding-top 50%
  // Sizes
  for dimension in $dimensions
    &.is-{dimension}x{dimension}
      height dimension * 1px
      width dimension * 1px