.pulse {
  overflow: visible;
  position: relative;
}
.pulse:before {
  content: '';
  display: block;
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-color: inherit;
  border-radius: inherit;
  transition: opacity .3s, transform .3s;
  animation: pulse-animation 1s cubic-bezier(0.24, 0, 0.38, 1) infinite;
	z-index: -1;
}
@keyframes pulse-animation {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0;
    transform: scale(1.5);
  }
  100% {
    opacity: 0;
    transform: scale(1.5);
  }
}