CSS3 3D 导航栏（animation，transform-style）demo效果

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      list-style: none;
    }
    ul {
      width: 600px;
      margin: 100px auto;
    }
    ul li {
      float: left;
      width: 120px;
      height: 40px;
      position: relative;

      /* 用于调试查看3D样式 */
      /* transform: rotateX(-27deg) rotateY(-62deg); */

      /* 子盒子保持3D效果 */
      transform-style: preserve-3d;

      transition: all 0.7s;
    }
    li span {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      background-color: green;
      text-align: center;
      line-height: 40px;
    }
    li span:nth-child(1) {
      transform: translateZ(20px); 
    }
    li span:nth-child(2) {
      background-color: yellow;
      transform: rotateX(90deg) translateZ(20px);
    }
    ul:hover li {
      transform: rotateX(-90deg);
    }
    ul li:nth-child(2) {
      transition-delay: 0.2s;
    }
    ul li:nth-child(3) {
      transition-delay: 0.4s;
    }
    ul li:nth-child(4) {
      transition-delay: 0.6s;
    }
    ul li:nth-child(5) {
      transition-delay: 0.8s;
    }
  </style>
</head>
<body>
  <ul>
    <li>
      <span>小说阅读器</span>
      <span>网站导航栏</span>
    </li>
    <li>
      <span>小说阅读器</span>
      <span>网站导航栏</span>
    </li>
    <li>
      <span>小说阅读器</span>
      <span>网站导航栏</span>
    </li>
    <li>
      <span>小说阅读器</span>
      <span>网站导航栏</span>
    </li>
    <li>
      <span>小说阅读器</span>
      <span>网站导航栏</span>
    </li>
  </ul>
</body>
</html>
demo 效果