.pulse {
  animation: pulse 0.7s infinite;
  margin: 0 auto;
  display: table;
  margin-top: 50px;
  animation-direction: alternate;
  -webkit-animation-name: pulse;
  animation-name: pulse;
  max-width: 300px;
}

@-webkit-keyframes pulse {
  0% {
    -webkit-transform: scale(1);
    -webkit-filter: brightness(100%);
  }
  100% {
    -webkit-transform: scale(1.1);
    -webkit-filter: brightness(120%);
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
    filter: brightness(100%);
  }
  100% {
    transform: scale(1.1);
    filter: brightness(120%);
  }
}