.pulse {
  box-shadow: 0 0 0 0 rgba(0, 0, 0, 1);
  transform: scale(1);
  animation: pulse 2s infinite;

  @keyframes pulse {
    0% {
      transform: scale(1);
      box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.5);
    }

    70% {
      transform: scale(1.02);
      box-shadow: 0 0 0 10px rgba(0, 0, 0, 0);
    }

    100% {
      transform: scale(1);
      box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
    }
  }
}