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老师批语：
3月27日作业提交
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>三分结构</title>
<style>
body,ul,li{
padding: 0;
margin:0;
}
body{
background-color: #e9e9e9;
background-image: url('/images/gufeng.jpg');
background-repeat: no-repeat;
}
.header{
width: 100%;
height: 200px;
background-color: lightskyblue;
}
.footer{
width: 100%;
height: 40px;
background-color: lightblue;
}
.container{
width: 80%;
min-height: 800px;
background-color: cyan;
margin:auto;
/*一定要加上overflow*/
overflow: hidden;
}
.main{
width: 100%;
height: 800px;
background-color: lightblue;
float: left;
}
.main .content{
background-color: cyan;
height:800px;
}
.left{
float: left;
height: 800px;
width: 20%;
background-color: green;
margin-left: -100%;
}
.right{
float: left;
height: 800px;
width: 20%;
background-color: wheat;
position: relative;
margin-left: -20%;
}
</style>
</head>
<body>
<div class="header"></div>
<div class="container">
<div class="main">
<div class="content"></div>
</div>
<div class="left"></div>
<div class="right"></div>
</div>
<div class="footer"></div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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