@keyframes slideInDemo {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}
.slide-demo {
  background: #007bff;
  color: white;
  padding: 15px;
  border-radius: 5px;
  animation-name: slideInDemo;
  animation-duration: 2s;
  animation-iteration-count: infinite;
  margin: 10px 0;
}