body {
	background:url("pexels-asad-photo-maldives-1430677.jpg")  no-repeat center center;
	background-size:cover;
	background-attachment:fixed;
	font-family:"Microsoft YaHei",Tahoma,sans-serif;
	margin:0 auto
}
.box {
	border-radius:5px;
	background-color:#fff;
	opacity:0.9;
	width:920px;
	font-size:16px;
	margin:30px auto
}
.title {
	text-align:center;
	font-size:36px;
	margin:20px auto;
    padding:10px;
}
.list {}
.catname {
	color:green;
	font-weight:700;
	width:70px;
	text-align:center;
	float:left;
	padding:5px
}
.sitename {
	width:110px;
	text-align:left;
	float:left;
	padding:5px
}
.clear {
	clear:both
}
.useful {
	padding:10px;
    text-align:center;
	color:#333;
	margin:20px auto
}
a {
	color:#333;
	text-decoration:none
}
a:hover {
	color:red
}