【CSS】リストの画像を一つずつ順番に横からスライドさせながらフェードインする方法のデモページ

.list {
  justify-content: space-between;
  display: flex;
  width: 700px;
  margin: 70px auto 0;
}

.list li {
  overflow: hidden;
  width: 31%;
  line-height: 0;
}

.list li p {
  opacity: 0;
  transform: translateX(10%);
}

.list li:nth-child(1) p{
  transition: opacity 1.4s ease-out 0s, transform 1.4s ease-out 0s;
}
.list li:nth-child(2) p{
  transition: opacity 1.4s ease-out 0.5s, transform 1.4s ease-out 0.5s;
}
.list li:nth-child(3) p{
  transition: opacity 1.4s ease-out 1s, transform 1.4s ease-out 1s;
}

.list.active li p{
  opacity: 1;
  filter: alpha(opacity=100);
  transform: translateY(0);
}

@media screen and (max-width:640px){
  .list {
    display: block;
    width: 50%;
  }
  .list li {
    width: 100%;
    margin: 0 0 10px;
  }
}

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