一个简单有趣的css动画效果

<html lang="en">  <head>    <meta charset="UTF-8" />    <meta name="viewport" content="width=device-width, initial-scale=1.0" />    <meta http-equiv="X-UA-Compatible" content="ie=edge" />    <title>3D正方体盒子旋转</title>    <style>      * {        margin: 0px;        padding: 0px;      }      #box2 {        width: 200px;        height: 200px;        position: absolute;        left: 0;        right: 0;        top: 0;        bottom: 0;        margin: auto auto;        transform-style: preserve-3d;        animation: cubeRotate 5s linear infinite;      }      .color_blue {        width: 200px;        height: 200px;        position: absolute;      }      .cube1 {        transform: rotateX(90deg) translateZ(100px);        background: url(./images/img1.jpg) no-repeat center/cover;      }      .cube2 {        transform: translateZ(-100px);        background: url(./images/img2.jpg) no-repeat center/cover;      }      .cube3 {        transform: rotateX(90deg) translateZ(-100px);        background: url(./images/img3.jpeg) no-repeat center/cover;      }      .cube4 {        transform: translateZ(100px);        background: url(./images/img4.jpeg) no-repeat center/cover;      }      .cube5 {        transform: rotateY(90deg) translateZ(100px);        background: url(./images/img5.jpg) no-repeat center/cover;      }      .cube6 {        transform: rotateY(90deg) translateZ(-100px);        background: url(./images/img6.jpeg) no-repeat center/cover;      }      @keyframes cubeRotate {        0% {          transform: rotateX(0) rotateY(0);        }        25% {          transform: rotateX(60deg) rotateY(180deg);        }        50% {          transform: rotateX(0) rotateY(360deg);        }        75% {          transform: rotateX(-60deg) rotateY(540deg);        }        100% {          transform: rotateX(0) rotateY(720deg);        }      }    </style>  </head>  <body>    <div id="box2">      <div class="color_blue cube1"></div>      <div class="color_blue cube2"></div>      <div class="color_blue cube3"></div>      <div class="color_blue cube4"></div>      <div class="color_blue cube5"></div>      <div class="color_blue cube6"></div>    </div>  </body></html>