.banner_box {
	width:100%;
	text-align:center;
}
.banner_box img {
	vertical-align:middle;
}
.roll_img_mb_01 {
	overflow:hidden;
	position:relative;
}
.roll_img_mb_01 .img_box {
	overflow:hidden;
	text-align:center;
}
.roll_img_mb_01 .img_box img {
	vertical-align:middle;
	width:100%;
}
.roll_img_mb_01 .nav_box {
	overflow:hidden;
	height:20px;
	position:absolute;
	right:10px;
	bottom:10px;
}
.roll_img_mb_01 .nav_box li {
	width:10px;
	height:10px;
	font-size:1px;
	overflow:hidden;
	background:#ddd;
	border-radius:50px;
	float:left;
	margin:4px;
}
.roll_img_mb_01 .nav_box .li_on {
	background-color: #333;
}