.pulse {
  width: 27px;
  height: 27px;
  background-color: #333;

  border-radius: 100%;
  -webkit-animation: scaleout 1.0s infinite ease-in-out;
  animation: scaleout 1.0s infinite ease-in-out;
}

@-webkit-keyframes scaleout {
  0% { -webkit-transform: scale(0.0) }
  100% {
    -webkit-transform: scale(1.0);
    opacity: 0;
  }
}

@keyframes scaleout {
  0% {
    transform: scale(0.0);
    -webkit-transform: scale(0.0);
  } 100% {
    transform: scale(1.0);
    -webkit-transform: scale(1.0);
    opacity: 0;
  }
}