body,ul,h1,h2,h3,p,h5,img,ol{
	margin: 0;padding: 0;
	font-family: "microsoft yahei", 'Helvetica';
}
li{
	list-style: none;
}
a{
	text-decoration: none;
	color: black;
}
a:hover{
	text-decoration: underline;
	color: rgb(0,0,238);
}
#article{
	width: 800px;
	height: auto;
	margin: 90px auto;
}
#article img{
	width: 100%;
	margin-top: 25px;
}
#article h2{
	text-align: center;
	padding: 20px;
}
#article ul li{
	padding:10px 0;
	padding-left: 30px;
	background: url(../image/book.png) no-repeat;
	background-size: 20px 20px;
	background-position: 0 10px;
	border-bottom: 1px solid #ddd;
}
#article ul li a.down{
	font-size: 14px;
	float: right;
	padding-left: 25px;
	background: url(../image/down.png) no-repeat 2px 0;
	background-size: 20px 20px;
}