h3 {
  background-color: #f7e3af;
  padding-left: 12px;
    
  animation-name: slidein;
  animation-duration: 2s;
}

@keyframes slidein {
  from {
    margin-left: -100%;
    width: 100%;
  }

  to {
    margin-left: 0%;
    width: 100%;
  }
}