.parallax {
  background-image: url(https://www.viajes.carrefour.es/statics/media/parques/disney/hotel-crockett-ranch/hoteldavycrockett.jpg);
  height: 350px;
  background-attachment: fixed;
  background-position: top;
  background-repeat: no-repeat;
  background-size: cover;
}
.parallax2 {
  background-image: url(https://www.viajes.carrefour.es/statics/media/parques/disney/hotel-crockett-ranch/hoteldavycrockett.jpg);
  height: 350px;
  background-attachment: fixed;
  background-position: top;
  background-repeat: no-repeat;
background-size: cover;