#banner{
	height: 820px;
}
#banner ul{
	height: 700px;
}
#banner li{
	display: none;
	position: absolute;
	left: 0;
	top: 85px;
	width: 100%;
	height: 100%;
	overflow: hidden;
	text-align: center;
}
#banner li img{
	position: absolute;
	left: 50%;
	top: 35px;
	margin-left: -960px;
}

#banner .btn{
	display: none;
	width: 50px;
	height: 50px;
	background: #666;
	opacity: .5;
	position: absolute;
	top: 40%;
	color: #fff;
	font-size: 30px;
	text-align: center;
	line-height: 30px;
	z-index: 20;
}
#banner .prev{
	left: 0;
}
#banner .next{
	right: 0;
}
.banner_nav{position: absolute;overflow: hidden;width: 100%;bottom: 60px;left: 0;z-index: 20;text-align: center;}
.banner_nav span{
	display: inline-block; 
	margin: 0 5px; 
	width: 32px;
    height: 4px;
    color: transparent;
    background: #fff;
    border: 0;
    border-radius: 1px;
    outline: none;
    cursor: pointer;
    opacity: .3;
    -webkit-transition: all .5s;
    -moz-transition: all .5s;
    transition: all .5s;
}
.banner_nav .active{
	opacity: 1;
}