SOURCE

  <div id="app">
    <ul class="pages">
      <!--一个li.paper包含了正反两页-->
      <li class="paper" data-left>
        <!--一个.page就是一页内容-->
        <div class="page page-back">
          <img src="https://img.zcool.cn/community/01b53c5b854b02a8012126ceab8c99.JPG@1280w_1l_2o_100sh.webp" alt>
        </div>
        <div class="page page-front">
          <img src="https://img.zcool.cn/community/0125735b854b02a8012126ce21e487.JPG@1280w_1l_2o_100sh.webp" alt>
        </div>
      </li>
      <li class="paper" data-right>
        <div class="page page-front">
          <img src="https://img.zcool.cn/community/01d7115b854b02a8012126ce136c1a.JPG@1280w_1l_2o_100sh.webp" alt>
        </div>
        <div class="page page-back">
          <img src="https://img.zcool.cn/community/01ecc75b854b02a80120245c620eb0.JPG@1280w_1l_2o_100sh.jpg" alt>
        </div>
      </li>
      <li class="paper">
        <div class="page page-back">
          <img src="https://img.zcool.cn/community/01644c5b854b06a80120245c52650e.JPG@1280w_1l_2o_100sh.jpg" alt>
        </div>
        <div class="page page-front">
          <img src="https://img.zcool.cn/community/018e225b854b07a8012126ce5740a9.JPG@1280w_1l_2o_100sh.jpg" alt>
        </div>
      </li>
    </ul>

  </div>

#app{
  margin: 50px;
}
ul,
li {
	margin: 0;
	padding: 0;
	list-style: none;
}
img {
	width: 240px;
	height: 300px;
	display: block;
}
.pages {
	width: 480px;
	height: 300px;
	position: relative;
}
.paper {
	display: none;
	position: absolute;
	/* 默认放在右边 */
  right: 0;
  top: 0;
  width: 240px;
  height: 300px;
  transform-style: preserve-3d;
}
.page{
	position: absolute;
  top: 0;
}
.paper[data-left],
.paper[data-right] {
	display: block;
	z-index: 1;
}
.paper[data-left] {
	right: auto;
	left: 0;
}
/* 把相邻的paper显示出来 */
.paper[data-right] + .paper {
	display: block;
}

.page-back {
	transform: scale(-1, 1);
}
.page-front {
  transform: translateZ(1px);
}
@keyframes flip-to-left {
	from {
		transform: perspective(600px) rotateY(0);
	}
	to {
		transform: perspective(600px) rotateY(-180deg);
	}
}
.paper[data-right] {
	transform-origin: left center;
  animation: flip-to-left 2s ease-in-out forwards;
}