.aaa {
  background-color: #3498db;
  color: #ffffff;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}