@keyframes box-am{
				from{
					transform: rotateX(-10deg) rotateY(0deg);
				}
				to{
					transform: rotateX(-10deg) rotateY(360deg);
				}
			}
			body{
				/*背景为黑色*/
				background-color: black;
			}

			/* #box相当于id="box" */
			#box {
				border: 2px solid white;
				height: 250px;
				width: 200px;
				position: fixed;
				left: calc(50% - 100px);
				top: calc(50% - 125px);
				transform-style: preserve-3d;
				transform: rotateX(30deg);
				animation-name: box-am;
				animation-duration: 20s;
				animation-iteration-count: infinite;
				animation-iteration-count: linear;
				
			}
			#box>img{
				width: 100%;
				height: 100%;
				position: absolute;
				left: 0px;
				top: 0px;
				box-shadow: 0px 0px 30px 20px white;
			}
			#box>img:nth-child(1){
				transform: rotateY(30deg) translateZ(500px);
			}
			#box>img:nth-child(2){
				transform: rotateY(60deg) translateZ(500px);
				
			}
			#box>img:nth-child(3){
				transform: rotateY(90deg) translateZ(500px);
			}#box>img:nth-child(4){
				transform: rotateY(120deg) translateZ(500px);
			}#box>img:nth-child(5){
				transform: rotateY(150deg) translateZ(500px);
			}#box>img:nth-child(6){
				transform: rotateY(180deg) translateZ(500px);
			}#box>img:nth-child(7){
				transform: rotateY(210deg) translateZ(500px);
			}#box>img:nth-child(8){
				transform: rotateY(240deg) translateZ(500px);
			}#box>img:nth-child(9){
				transform: rotateY(270deg) translateZ(500px);
			}#box>img:nth-child(10){
				transform: rotateY(300deg) translateZ(500px);
			}#box>img:nth-child(11){
				transform: rotateY(330deg) translateZ(500px);
			}#box>img:nth-child(12){
				transform: rotateY(360deg) translateZ(500px);
			}