// image filter-set.
@mixin filter-set {
  &.blur { filter: blur(4px); }
  &.lighten { filter: brightness(1.25); }
  &.darken { filter: brightness(.75); }
  &.contrast { filter: contrast(150%); }
  &.gray { filter: grayscale(100%); }
  &.hue-rotate { filter: hue-rotate(90deg); }
  &.invert { filter: invert(100%); }
  &.opacity { filter: opacity(50%); }
  &.saturate { filter: saturate(200%); }
  &.sepia { filter: sepia(100%); }
}