body {
 	margin: 0;
 	padding: 0;
 	background-color: rgb(240, 240, 240);
 }

 #box {
 	width: 1200px;
 	height: 1700px;
 	margin: auto;
 	background-color: white;
 }

 .xa {
 	margin-top: -50px;
 }

 nav {
 	width: 1200px;
 	height: 60px;
 	background-color: black;
 	position: relative;
 	margin-top: -80px;
 }

 nav li {
 	display: inline-block;
 	margin-left: 68px;
 	margin-top: 15px;
 }

 a {
 	color: white;
 	text-decoration: none;
 	font-size: 20px;
 	font-weight: bold;
 }

 .x {
 	font-family: 华文行楷;
 	font-size: 140px;
 	margin-top: -450px;
 	color: wheat;
 	margin-left: 80px;
 }

 .an {
 	font-family: 华文行楷;
 	font-size: 140px;
 	margin-top: -220px;
 	color: wheat;
 	margin-left: 150px;
 }

 a:hover {
 	background-color: white;
 	color: black;
 }

 .dq {
 	text-align: center;
 	margin-top: 250px;
 	font-size: 20px;
 	color: gray;
 }
 
 .zi10 {
 	font-family: 宋体;
 	margin-top: 40px;
 	padding: 0 45px;
 }

 #tb {
 	width: 1000px;
 	height: 250px;
 	font-family: 宋体;
 	background-color: rgb(240, 240, 240);
 	text-align: center;
 	border: 2px solid black;
 	margin: 30px auto;
 }

 .foot {
 	width: 1200px;
 	height: 80px;
 	margin-top: 80px;
 	background-color: black;
 }

 .di {
 	color: white;
 	text-align: center;
 	padding-top: 25px;
 }