/*body {
    background:url('https://www.cnblogs.com/images/cnblogs_com/hszstudypy/1506930/o_two.jpg') 
    fixed;   //修改背景图片
    background-position: 50% 5%;
    background-size: cover;
    background-repeat: no-repeat;
    font-family: "Comic Sans MS"，'Helvetica Neue',Helvetica,Verdana,'Arial',sans-serif;
    font-size: 12px;
    min-height: 101%;
}*/

body { 
     background-color: #efefef;
     background-image:url('https://images.cnblogs.com/cnblogs_com/blogs/682848/galleries/1972863/o_210510011739boeing.jpeg'); 
     background-repeat: no-repeat; 
     background-attachment: fixed; 
     background-position: center 0; 
     background-size: cover; 
    padding-top:0px;
  }
div{
opacity:0.95;
}
#ad_t2,#cnblogs_c1,#under_post_news,#cnblogs_c2,#under_post_kb {
    display:none; !important
}

<pre name="code" class="css">*{
    padding:0;
    margin:0;
}
body{
    width:100%;
    height:40%;
    // background:linear-gradient(darkred 0%,black 100%);
}
#react{
    width: 200px;
    height:200px;
    margin: 150px auto;
    transform-style:preserve-3d;
    animation:rotate 20s infinite;
    animation-timing-function: linear;
}
#react div{
    position:absolute;
    transition: all .4s;
}
div .out_pic{
    width:200px;
    height:200px;
    opacity:0.9;
}
div .in_pic{
    width:100px;
    height:100px;
}
#react span{
    display:block;
    position:absolute;
    width:100px;
    height:100px;
    top:50px;
    left:50px;
}
@keyframes rotate{
    from{transform: rotateX(0deg) rotateY(0deg);}
    to{transform: rotateX(360deg) rotateY(360deg);}
}
  
  
.out_front{
    transform:translateZ(100px);
}
.out_back{
    transform:translateZ(-100px);
}
.out_left{
    transform:rotateY(90deg) translateZ(100px);
}
.out_right{
    transform: rotateY(-90deg) translateZ(100px);
}
.out_top{
    transform:rotateX(90deg) translateZ(100px);
}
.out_bottom{
    transform: rotateX(-90deg) translateZ(100px);
}
.in_front{
    transform:translateZ(50px);
}
.in_back{
    transform:translateZ(-50px);
}
.in_left{
    transform:rotateY(90deg) translateZ(50px);
}
.in_right{
    transform: rotateY(-90deg) translateZ(50px);
}
.in_top{
    transform:rotateX(90deg) translateZ(50px);
}
.in_bottom{
    transform: rotateX(-90deg) translateZ(50px);
}
  
/*外面的图片散开*/
#react:hover .out_front{
    transform:translateZ(200px);
}
#react:hover .out_back{
    transform:translateZ(-200px);
}
#react:hover .out_left{
    transform:rotateY(90deg) translateZ(200px);
}
#react:hover .out_right{
    transform: rotateY(-90deg) translateZ(200px);
}
#react:hover .out_top{
    transform:rotateX(90deg) translateZ(200px);
}
#react:hover .out_bottom{
    transform: rotateX(-90deg) translateZ(200px);
}
  
  
/*里面的图片散开*/
#react:hover .in_front{
    transform:translateZ(100px);
}
#react:hover .in_back{
    transform:translateZ(-100px);
}
#react:hover .in_left{
    transform:rotateY(90deg) translateZ(100px);
}
#react:hover .in_right{
    transform: rotateY(-90deg) translateZ(100px);
}
#react:hover .in_top{
    transform:rotateX(90deg) translateZ(100px);
}
#react:hover .in_bottom{
    transform: rotateX(-90deg) translateZ(100px);
}