圣杯布局是一种三列布局，两边定宽，中间自适应：
圣杯布局的原理就是当子元素处于浮动状态时，设置负margin，子元素会叠盖到兄弟元素之上。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>圣杯布局</title>
<link rel="stylesheet" href="">
<style>
.content {
width: 80%;
margin: 0 auto;
}
.main {
width: 100%;
height: 200px;
float: left;
background: orange;
box-sizing: border-box;
padding-left: 200px;
padding-right: 200px;
}
.left {
width: 200px;
height: 200px;
background: red;
float: left;
margin-left: -100%;
}
.right {
width: 200px;
height: 200px;
background: blue;
float: left;
margin-left: -200px;
}
</style>
</head>
<body>
<div class="content">
<div class="main">Main</div>
<div class="left"></div>
<div class="right"></div>
</div>
</body>
</html>
时间： 2024-10-13 19:10:30