效果图：
html代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>湖南城市学院</title> <link rel="stylesheet" type="text/css" href="css/hncu.css" />
</head> <body>
<div id="hncu_header"> </div> <ul id="hncu_nav">
<li>
<a href="#">首页</a>
</li> <li>
<a href="#">新闻</a>
</li> <li>
<a href="#">联系</a>
</li> <li>
<a href="#">关于</a>
</li>
</ul> <div id="hncu_content">
<div id="hncu_left"></div>
<div id="hncu_center"></div>
<div id="hncu_right"></div>
</div> <div id="hncu_footer"> </div>
</body>
</html>
css代码：
@charset "utf-8";
*{
margin: 0px;
padding: 0px;
}
body{
background-color: #bfc;
}
#hncu_header{
width: 1000px;
height: 200px;
background-color: skyblue;
margin:10px auto 10px;
}
#hncu_nav{
width: 1000px;
height: 70px;
background-color: blue;
list-style:none;
margin:0px auto 10px;
overflow:hidden;
zoom:;
}
#hncu_nav li{
width: 25%;
height: 70px;
float: left;
}
#hncu_nav a{
width: 100%;
height: 70px;
color: white;
line-height: 70px;
text-align: center;
text-decoration: none;
float: left;
}
#hncu_nav a:link{
background-color: blue;
}
#hncu_nav a:visited{
background-color: blue;
}
#hncu_nav a:hover{
background-color: red;
}
#hncu_nav a:active{
color: blue;
}
#hncu_content{
width: 1000px;
height: 600px;
background-color: yellow;
margin:0px auto 10px;
}
#hncu_left{
width: 200px;
height: 500px;
background-color: green;
margin-top:50px;
float:left;
}
#hncu_center{
width: 580px;
height: 500px;
background-color: #bfc;
margin-top:50px;
margin-right: 10px;
margin-left: 10px;
float:left;
}
#hncu_right{
width: 200px;
height: 500px;
background-color: pink;
margin-top:50px;
float:left;
}
#hncu_footer{
width:1000px;
height:200px;
background-color:skyblue;
margin:0px auto 10px;
}