*{
	padding:0;
	margin: 0;
}
html{
	background:linear-gradient(#032861 0%,#000000 80%);
	height: 100%;  
	width: 100%;
	overflow: hidden;
}

/*满天星*/
.wall{
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    overflow: hidden;
}
div#midground{
    background: url("../img/midground.png");
   /* z-index:1;*/ overflow: hidden;
    animation: cc 20s linear infinite;
}
div#foreground{
    background: url("../img/foreground.png"); overflow: hidden;
    /* z-index:2; */
    animation: cc 10s linear infinite;
}

@keyframes cc {
    0%{
        background-position: 0 0;
    }
    100%{
        background-position: 1000% 0;
    }
}


.wrap{
	height: 200px;
	width: 200px;
	margin: 250px auto;
	position: relative;
	perspective:2000px;
	/*实现3d效果*/
	transform-style:preserve-3d; /*	表示所有子元素在3D空间中呈现。*/
	transform:rotateX(20deg) rotateY(30deg); /*定义转换，只是用 X 轴的值。   定义转换，只是用 Y 轴的值。*/
	transform-origin: 50% 50% 0; /*单独100px也行*/
	animation:move 4s linear infinite;
	/*  linear:每一步的距离和前一步都是相同的，也就是等速
	若不加linear，那会默认速度会加快然后最后一点距离再减速 */
}
/*大正方形样式*/
.wrap .box{
	position: absolute;
	width: 200px;
	 height: 200px;
	 opacity: 0.8;
	transition: 2s;
}
/* translateZ(z)  定义 3D 转换，只是用 Z 轴的值。*/
/* scaleY(y)   通过设置 Y 轴的值来定义缩放转换。*/
.wrap>img:nth-child(1){
transform: rotateY(0deg) translateZ(100px);
}
.wrap>img:nth-child(2){
transform: translateZ(-100px) rotateY(180deg);
}
.wrap>img:nth-child(3){
transform: rotateY(90deg) translateZ(100px);
}
.wrap>img:nth-child(4){
transform: rotateY(-90deg) translateZ(100px);
}
.wrap>img:nth-child(5){
transform: rotateX(90deg) translateZ(100px);
}
.wrap>img:nth-child(6){
transform: rotateX(-90deg) translateZ(100px);
}
/*小正方形*/
.wrap .square {
	display: bloack;
	width: 100px;
	height: 100px;
	position: absolute;
	left: 50px;
   top:50px;
}
.wrap>img:nth-child(7){
transform: rotateY(0deg) translateZ(50px);
}
.wrap>img:nth-child(8){
transform: translateZ(-50px) rotateY(180deg);
}
.wrap>img:nth-child(9){
transform: rotateY(90deg) translateZ(50px);
}
.wrap>img:nth-child(10){
transform: rotateY(-90deg) translateZ(50px);
}
.wrap>img:nth-child(11){
transform: rotateX(90deg) translateZ(50px);
}
.wrap>img:nth-child(12){
transform: rotateX(-90deg) translateZ(50px);
}
@-webkit-keyframes move{
/* from{transform: rotateX(0deg) rotateY(0deg);}
to{transform: rotateX(360deg) rotateY(360deg);} */
/* 上面和下面是一样的 */
0%{
  transform: rotateX(0deg) rotateY(0deg);
}
100%{
  transform: rotateX(360deg) rotateY(360deg);
}
}
/* cursor属性定义了鼠标指针放在一个元素边界范围内时所用的光标形状 */
.wrap:hover{
cursor:pointer;
}
.wrap:hover>img:nth-child(1){
transform: rotateY(0deg) translateZ(200px);
}
.wrap:hover>img:nth-child(2){
transform: translateZ(-200px) rotateY(180deg);
}
.wrap:hover>img:nth-child(3){
transform: rotateY(90deg) translateZ(200px);
}
.wrap:hover>img:nth-child(4){
transform: rotateY(-90deg) translateZ(200px);
}
.wrap:hover>img:nth-child(5){
transform: rotateX(90deg) translateZ(200px);
}
.wrap:hover>img:nth-child(6){
transform: rotateX(-90deg) translateZ(200px);
}