技术：
animation: donghua 5s linear infinite;
transform: translateX(-100px) rotateY(-90deg);

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .box{
            width: 500px;
            height: 500px;
            border: 5px solid #000;
            margin: 50px auto;
            /* 父元素变为旋转舞台 */
            transform-style: preserve-3d;
            transform: rotateY(50deg) rotateX(50deg);
            position: relative;
            animation: donghua 5s linear infinite;
        }
        .box>div{
            width: 200px;
            height: 200px;
            font-size: 100px;
            text-align: center;
            line-height: 200px;
            position: absolute;
            left: 150px;
            top: 150px;
        }
        /* 前 */
        .box>div:nth-child(1){
            background-color: rgb(247, 228, 199);
            transform: translateZ(100px) ;
        }
        /* 左 */
        .box>div:nth-child(2){
            background-color: rgb(248, 195, 195);
            /* 先平移后旋转 */
            transform: translateX(-100px) rotateY(-90deg);
        }
        /* 上 */
        .box>div:nth-child(3){
            background-color: rgb(198, 245, 239);
            transform: translateY(-100px) rotateX(90deg);
        }
        /* 下 */
        .box>div:nth-child(4){
            background-color: rgb(241, 185, 207);
            transform: translateY(100px) rotateX(-90deg);
        }
        /* 右 */
        .box>div:nth-child(5){
            background-color: rgb(243, 209, 220);
            transform: translateX(100px) rotateY(90deg);
        }
        /* 后 */
        .box>div:nth-child(6){
            background-color: rgb(228, 205, 245);
            transform: translateZ(-100px)  rotateY(180deg);
        }

        @keyframes donghua{
            0%{
                transform: rotateX(20deg) rotateY(20deg) ;

            }
            50%{
                transform: rotateX(360deg) rotateY(360deg);
            }
            100%{
                transform: rotateX(20deg) rotateY(20deg) ;
            }
        }
    </style>
</head>
<body>
    <div class="box">
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
    </div>
</body>
</html>

[css3] 小案例---旋转立方体_html

[css3] 小案例---旋转立方体_html_02