$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
  @each $dimension in $dimensions
    &.is-#{$dimension}x#{$dimension}
      height: $dimension * 1px
      width: $dimension * 1px