/*定义一个动画*/
			 @keyframes wanzi{
			 	from{
					transform: rotateX(-10deg) rotateY(0deg);
				}
			 	to{
					transform: rotateX(-10deg) rotateY(360deg);
				}
			 }
		body{
			/*背景为黑色*/
			background-color: black;
		}
		/**/
		#box{
			border: 2px;
			height: 250px;
			width: 200px;
			/*固定点位，以浏览器为标准进行定位*/
			position: fixed;
			left: calc(50% - 100px);
			top: calc(50% - 125px);
			
			/*把盒子变成一个3D盒子*/
			transform-style: preserve-3d;
			transform: rotateX(-10deg);
			/*使用刚刚定义的动画*/
			animation-name: wanzi;
			animation-duration: 20s;
			animation-iteration-count:infinite;
			animation-timing-function:linear;
		}
		/*id="box"下面的所有img标签*/
		#box>img{
			width: 100%;
			height: 100%;
			/*绝对定位，以父级为标准进行定位*/
			position: absolute;
			left: 0px;
			top: 0px;
		}
		/*第一张照片*/
		#box>img:nth-child(1){
			transform: rotateY(30deg) translateZ(600px);
		}
		#box>img:nth-child(2){
			transform: rotateY(60deg) translateZ(600px);
		}
		#box>img:nth-child(3){
			transform: rotateY(90deg) translateZ(600px);
		}
		#box>img:nth-child(4){
			transform: rotateY(120deg) translateZ(600px);
		}
		#box>img:nth-child(5){
			transform: rotateY(150deg) translateZ(600px);
		}
		#box>img:nth-child(6){
			transform: rotateY(180deg) translateZ(600px);
		}
		#box>img:nth-child(7){
			transform: rotateY(210deg) translateZ(600px);
		}
		#box>img:nth-child(8){
			transform: rotateY(240deg) translateZ(600px);
		}
		#box>img:nth-child(9){
			transform: rotateY(270deg) translateZ(600px);
		}
		#box>img:nth-child(10){
			transform: rotateY(300deg) translateZ(600px);
		}
		#box>img:nth-child(11){
			transform: rotateY(330deg) translateZ(600px);
		}
		#box>img:nth-child(12){
			transform: rotateY(360deg) translateZ(600px);
		}