.banner {
	width:100%;
	height:600px;
	font-size:0;
	overflow:hidden;
	position:relative
}
.banner_img {
	width:100%;
	height:600px;
	position:absolute;
	left:0;
	top:0
}
.banner_img li {
	width:100%;
	height:600px;
	display:inline-block;
	background-position:center;
	background-repeat:no-repeat;
	float:left;
	list-style:none
}
.banner_list {
	height:50px;
	top:550px;
	position:relative;
	margin:0 auto;
	z-index:1
}
.banner_list span {
	display:block;
	cursor:pointer;
	width:14px;
	height:14px;
	border-radius:50%;
	border:3px solid #555;
	float:left;
	margin:0 5px
}
.banner_list .spcss {
	border:3px solid #9acd32
}
.banner_left {
	position:absolute;
	height:90px;
	width:60px;
	top:50%;
	left:-60px;
	background-color:rgba(73,72,62,.6);
	margin-top:-45px;
	text-align:center;
	transition:all .5s;
	z-index:2
}
.banner_left:hover {
	background-color:rgba(73,72,62,.9)
}
.banner_right {
	position:absolute;
	height:90px;
	width:60px;
	top:50%;
	right:-60px;
	background-color:rgba(73,72,62,.6);
	margin-top:-45px;
	text-align:center;
	transition:all .5s;
	z-index:2
}
.banner_right:hover {
	background-color:rgba(73,72,62,.9)
}
.banner_left img {
	margin-top:22px
}
.banner_right img {
	margin-top:22px
}