body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
    perspective: 1000px; /* 定义3D空间 */
}
 
.cube {
    width: 200px;
    height: 200px;
    position: relative;
    transform-style: preserve-3d; /* 保持3D变换 */
    animation: rotate 60s infinite linear; /* 无限旋转动画 */
}
 
.face {
    position: absolute;
    width: 200px;
    height: 200px;
    background: rgba(234, 234, 255, 0.5);
    border: 1px solid #ccc;
}
 
.front  { transform: translateZ(100px); }
.back   { transform: rotateY(180deg) translateZ(100px); }
.right  { transform: rotateY(90deg) translateZ(100px); }
.left   { transform: rotateY(-90deg) translateZ(100px); }
.top    { transform: rotateX(90deg) translateZ(100px); }
.bottom { transform: rotateX(-90deg) translateZ(100px); }
 
@keyframes rotate {
    from { transform: rotateX(0deg) rotateY(0deg); }
    to { transform: rotateX(360deg) rotateY(360deg); }
}