@keyframes box-ani{
		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 {
/* 设置边框 */
border: 0px solid white;
height: 250px;
width: 200px;
/* 固定定位，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的盒子 */
transform-style: preserve-3d;
transform: rotateX(-10deg);
animation-name:box-ani;
animation-duration: 20s;
animation-iteration-count: infinite;
transition-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;
box-shadow: 0px 0px 20px 10px white;
}
/* 第一张图片 */
#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);
}