* {
	margin:0;
	padding:0;
}
ul {
	list-style:none;
}
.banner {
	width:600px;
	height:300px;
	border:2px solid #ccc;
	margin:100px auto;
	position:relative;
	overflow:hidden;
	z-index:1;
}
.img {
	position:absolute;
	top:0;
	left:0;
}
.des {
	position:absolute;
	bottom:0;
	left:0;
	z-index:-2;
	background:rgba(0,0,0,.4)
}
.des li {
	float:left;
	width:600px;
}
.img li {
	float:left;
}
.num {
	position:absolute;
	bottom:10px;
	width:100%;
	text-align:center;
	font-size:0;
}
.num li {
	width:10px;
	height:10px;
	background:rgba(0,0,0,0.5);
	border-radius:100%;
	display:inline-block;
	margin:0 5px;
	cursor:pointer;
}
.btn {
	display:none;
}
.btn span {
	display:block;
	width:50px;
	height:100px;
	background:rgba(0,0,0,0.6);
	color:#fff;
	font-size:40px;
	line-height:100px;
	text-align:center;
	cursor:pointer;
}
.btn .prev {
	position:absolute;
	left:0;
	top:50%;
	margin-top:-50px;
}
.btn .next {
	position:absolute;
	right:0;
	top:50%;
	margin-top:-50px;
}
.num .active {
	background-color:#fff;
}
.hide {
	display:none;
}