* {
	margin: 0;
	padding: 0;
}

ul, li {
	list-style: none;
}

img {
	border: none;
}

.clear {
	clear: both;
	zoom: 1;
}

.clear:after {
	content: '';
	height: 0;
	display: visibility;
	clear: both;
	overflow: hidden;
}

#box {
	width: 500px;
	height: 300px;
	margin: 10px auto;
	position: relative;
}

#img {
	height: 100%;
}

#img img {
	width: 100%;
	height: 100%;
	display: none;
}

#num li {
	float: left;
	background-color: gray;
	width: 20px;
	height: 20px;
	border-radius: 50%;
	text-align: center;
	line-height: 20px;
	color: #fff;
	font-weight: bold;
	margin-left: 5px;
	cursor: pointer;
}

#num {
	position: absolute;
	bottom: 5px;
	right: 5px;
}

#num li:hover {
	background-color: #f80;
}

#num li.active {
	background-color: #f80;
}