.a-pulse-slow {
  @include keyframes(pulseSlow) {
    0% {
      transform: scale(1);
      opacity: 1;
    }

    100% {
      transform: scale(0.85);
      opacity: 0.5;
    }
  }

  @include show();
  @include animate(pulseSlow alternate infinite ease-in-out $pulse-slow-timing);
}