.spinner {
  margin: 0 auto;
  background-color: #333333;
  width: 40px;
  height: 40px;
  border-radius: 100%;
  -webkit-animation: pulseScaleOut 1s infinite ease-in-out;
          animation: pulseScaleOut 1s infinite ease-in-out;
}

@-webkit-keyframes pulseScaleOut {
  0% {
    -webkit-transform: scale(0);
            transform: scale(0);
  }
  100% {
    -webkit-transform: scale(1);
            transform: scale(1);
    opacity: 0;
  }
}
@keyframes pulseScaleOut {
  0% {
    -webkit-transform: scale(0);
            transform: scale(0);
  }
  100% {
    -webkit-transform: scale(1);
            transform: scale(1);
    opacity: 0;
  }
}