/* ------------------------------------------------------------------------ *\
   mixins.animation.overlay
\* ------------------------------------------------------------------------ */


/**
 * [overlay__keyframes description]
 * @return {[type]} [description]
 */
a-overlay__keyframes()
  @keyframes overlay
    from
      opacity: 0

    to
      opacity: 1


/**
 * [overlay description]
 * @return {[type]} [description]
 */
a-overlay()
  animation-name: overlay
  animation-duration: nix.animations.duration
  animation-fill-mode: both
  animation-timing-function: nix.animations.easing


/**
 * [slow description]
 * @return {[type]} [description]
 */
a-overlay--slow()
  animation-duration: nix.animations.duration-slow


/**
 * [fast description]
 * @return {[type]} [description]
 */
a-overlay--fast()
  animation-duration: nix.animations.duration-fast