* {
				margin: 0;
				padding: 0;
				list-style: none;
			}
			
			.banner {
				position: relative;
				width: 100%;
				height: 350px;
				margin: 0 auto;
				overflow: hidden;
			}
			
			.banner_img {
				position:relative;
				left:0;
				top:0;
			}
			
			.banner_img li {
				float: left;
			}
			
			.banner_img li a {
				width: 100%;
				display: block;
				height: 350px;
			}
			
			.banner_num {
				width: 100%;
				position: absolute;
				bottom: 10px;
				left: 0;
				text-align: center;
				font-size: 0;
			}
			
			.banner_num li {
				width: 15px;
				height: 15px;
				border: 3px solid #ccc;
				border-radius: 50%;
				display: inline-block;
				margin: 0 3px;
				cursor: pointer;
			}
			
			.banner_num .on {
				border: 3px solid #EB8F00;
			}
			
			.banner .btn {
				width: 30px;
				height: 50px;
				background: rgba(0, 0, 0, .5);
				position: absolute;
				top: 50%;
				margin-top: -25px;
				cursor: pointer;
				line-height: 50px;
				text-align: center;
				color: #fff;
				font-family: "宋体";
				font-size: 30px;
				display:none;
			}
			.banner:hover .btn{
				display:block;
			}
			
			.banner .btn_l {
				left: 0;
			}
			
			.banner .btn_r {
				right: 0;
			}