body{background-color: #1F1F1F}
.banner {
	width: 100%;
	height: 500px;
	background-color: aqua;
	position: relative;
	overflow: hidden;
	cursor: pointer;
}
.imgbox {
	width: 100%;
	height: 500px;
	position: relative;
	background-color: #222222;
	overflow: hidden;
}
.img {
	position: absolute;
	display: none;
	left: 50%;
	margin-left: -683px;
}
.im {
	display: block;
}
.change {
	height: 100px;
	display: block;
	position: absolute;
	z-index: 20;
	opacity: 0.4;
	transition: 0.4s;
	top: 50%;
	margin-top: -50px
}
.change:hover {
	opacity: 1;
}
.pre {
	left: 1%;
}
.next {
	right: 1%;
}
.cirbox {
	width: 88px;
	position: absolute;
	bottom: 15px;
	z-index: 10;
	left: 50%;
	margin-left: -44px;
	cursor: pointer;
}
.cir {
	width: 12px;
	height: 12px;
	background-color: white;
	opacity: 0.4;
	float: left;
	border-radius: 6px;
	margin: 0 5px 0 5px;
	cursor: pointer;
}
.cir:hover {
	background-color: cyan;
	transition: 0.8s;
}
.cr {
	opacity: 1;
}
.cr:hover {
	background-color: white;
}