#mask
  single-transition(opacity, 250ms)
  @extend .fixed
  background: url('../img/ajax-loader.gif') no-repeat center center #fff
  height: 100%
  left: 0
  opacity: 1
  top: 0
  width: 100%

  &.ng-animate
    display: block !important

  &.ng-hide
    opacity: 0