* {
	margin:0;
	padding:0;
}
.box {
	width:600px;
	height:450px;
	margin:100px auto;
	position:relative;
}
ul {
	list-style:none;
}
.imga {
	width:100%;
	height:100%;
	position:relative;
}
.item img {
	width:600px;
	height:450px;
}
.item {
	position:absolute;
	transition:all 1s;
	opacity:0;
}
.item.active {
	z-index:100;
	opacity:1;
}
.dian {
	position:absolute;
	right:250px;
	bottom:20px;
	z-index:10000;
}
.point {
	width:10px;
	height:10px;
	background-color:rgb(202,202,207);
	border-radius:10px;
	float:left;
	margin-right:10px;
	cursor:pointer;
}
.point.active {
	background-color:rgb(0,0,0);
}
.box:hover .btn {
	display:block;
}
.btn {
	width:30px;
	height:60px;
	font-size:30px;
	opacity:.5;
	border:none;
	position:absolute;
	top:195px;
	cursor:pointer;
	display:none;
	z-index:1000;
}
#right {
	right:0;
}
#left {
	left:0;
}