@-webkit-keyframes pulsate-outer-ring {

  0%, 80%, 100% {
    transform: none;
    -moz-transform: none;
    -webkit-transform: none;
    opacity: 0;
  }
  25%,30% {
    opacity: 1;
  }
  35%,40% {
    transform: scale(1.1, 1.1);
    -webkit-transform: scale(1.1, 1.1);
    opacity: 1;
  }
  50% {
    transform: scale(1.8, 1.8);
    -webkit-transform: scale(1.8, 1.8);
    opacity: 0;
  }

}