/* ------------------------------------------
 * IT书包
 * 网址：www.itshubao.com
 * 整理：yinq<3331653644@qq.com> 
 -------------------------------------------- */
body{
	margin:0;
	background:#222;
	
	margin:20px;
}
svg{
	width:100%;
	height:100%;
	position:fixed;
	top:0;
	left:0;
}
span{
	color:white;
	font-family:sans-serif;
	opacity:.3;
}