html,body{height:100%;}
.bg{background-image:url('../images/cj/bg.jpg');background-size:100%;height:100%;}
	.bg div{position:fixed;width:100%;color:#ffffff;font-size:20px;text-align:center;height:80px;line-height:80px;top:30%;}
	.bg ul{position:fixed;width:100%;height:15%;top:45%;}
		.bg ul li{float:left;width:25%;text-align:center;}
			.bg ul li img{width:90%;}