【CSS】Technique to make 3D fade-in using transform:scale() to background image | Demo page

.wrap {
  width: 768px;
  margin: 50px auto 0;
}

.block {
  opacity: 0;
  width: 100%;
  padding: 66.625% 0 0;
  transform: scale(1.05);
  transition: opacity .8s ease-out, transform 1.8s ease-out;
  background: url(/img/a.jpg) no-repeat center top;
  background-size: cover;
}

.block.active {
  opacity: 1;
  transform: scale(1);
}

@media screen and (max-width:640px){
  .wrap {
    width: 100%;
  }
}
  

$(window).on('load', function(){
  $(".block").addClass("active");
});