<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>3D Sunstance (Substantial) cube</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      body {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        width: 100%;
        height: 100vh;
        background: #606060;
        /* 视角，必须开视角才可以看到旋转位移的3D属性 */
        perspective: 500px;
        overflow: hidden;
      }
      .main {
        position: relative;
        width: 200px;
        height: 200px;
        margin: 0 auto;
        margin-top: 200px;
        /* 
          必须声明 transform-style:preserve-3d 才可以展示3D属性的变化
          因为其默认 2d ,transform-style:flat 
        */
        transform-style:preserve-3d; 
          animation:run 10s infinite;
      }
      .box {
        width: 200px;
        height: 200px;
        background-color: #f9bf3b;
        display: grid;
        place-items: center;
        font-size: 50px;
        position: absolute;
        opacity: 0.6;
      }
      .box:first-child {
        transform: rotateY(90deg) translateZ(100px);
      }
      .box:nth-child(2) {
        transform: rotateY(-90deg) translateZ(100px);
        background-color: #8e44ad;
      }
      .box:nth-child(3) {
        transform: rotateX(90deg) translateZ(100px);
        background-color: #22a7f0;
      }
      .box:nth-child(4) {
        transform: rotateX(-90deg) translateZ(100px);
        background-color: #ffa27b;
      }
      .box:nth-child(5) {
        transform: rotateX(180deg) translateZ(100px);
        background-color: #e74c3c;
        z-index: -1;
      }
      .box:nth-child(6) {
        transform: rotateY(0deg) translateZ(100px);
        background-color: #ecf0f1;
      }
      @keyframes run {
        0% {
          transform: rotateY(0);
        }
        10% {
          transform: rotateY(180deg);
        }
        20% {
          transform: rotateX(180deg);
          /* transform: rotateY(180deg); */
        }
      }
    </style>
  </head>
  <body>
    <div class="main">
      <div class="box">右</div>
      <div class="box">左</div>
      <div class="box">上</div>
      <div class="box">下</div>
      <div class="box">后</div>
      <div class="box">前</div>
    </div>
  </body>
</html>