.pulsate {
  opacity: 0.3;
  -webkit-animation: pulsate 1.5s ease-out;
  -webkit-animation-iteration-count: infinite;
}

@-webkit-keyframes pulsate {
  0% {
    opacity: 0.3;
  }
  50% {
    opacity: 1.0;
  }
  100% {
    opacity: 0.3;
  }
}