<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>立方体动画</title>
<style type="text/css">
body,div,p,ul,ol,li,dl,dt,dd,table,tr,td,form,hr,fieldset,h1,h2,h3,h4,h5,h6,img,input{
margin:0;
padding:0;
}
html,body{
height: 100%;
}
body{
background: url(img/body_bg.png) repeat-x;
background-size: 100% 100%;
display: flex;
justify-content: center;
align-items: center;
}
.box{
width: 200px;
height: 200px;
/*background: blue;*/
transform-style: preserve-3d;
/*transform:rotateY(30deg) rotateX(-15deg);*/
animation:lft_ani 8s infinite linear;
}
.box a{
display: block;
opacity: .4;
border: 1px solid black;
transform-style:preserve-3d;
}
.box .small{
width: 100px;
height: 100px;
background: #18fa07;
position: absolute;
left: 50px;
top: 50px;
}
.box .big{
width: 200px;
height: 200px;
background:#2501fd;
position: absolute;
left: 0;
top: 0;
transition: all 1s;
}
.box .big:nth-of-type(1){