<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        ul{
            position: relative;/*相对定位*/
            width: 200px;
            height: 200px;
            transform-style: preserve-3d;/*将所有子元素呈现在3d空间中*/
            margin: 250px auto;
            animation: run 5s infinite linear;
        }
        li{
            list-style: none;
            width:200px;
            height: 200px;
            position: absolute;
            left: 0;
            top: 0;
            opacity: 0.4;
        }
        li:first-child{
            background: red;
            transform: translateZ(100px)/*用translateZ将面都沿着Z轴平移了100像素*/
        }
        li:nth-child(2){
            background: green;
            transform: translateY(-100px) rotateX(90deg);
        }
        li:nth-child(3){
            background: pink;
            transform: translateY(100px) rotateX(90deg);
        }
        li:nth-child(4){
            background: orange;
            transform: translateX(-100px) rotateY(90deg);
        }
        li:nth-child(5){
            background: blue;
            transform: translateX(100px) rotateY(90deg);
        }
        li:nth-child(6){
            background: blue;
            transform: translateZ(-100px);
        }

    </style>
</head>
<body>
    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
    </ul>

</body>
</html>