实现圣杯布局（双飞翼布局）方式
圣杯布局（双飞翼布局）：左右两边盒子的宽度固定不会随着屏幕大小的改变而改变，中间盒子宽度自适应
方法一：利用定位
思路：左右两边盒子绝对定位，中间盒子给长度为两边盒子宽度为的padding值
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
.box {
position: relative;
width:100%;
height:400px;
}
.center {
height: 400px;
padding: 0 100px;
background-color: orange;
}
.left,
.right {
position: absolute;
top: 0;
width: 100px;
height: 400px;
background-color: pink;
}
.left {
left: 0;
}
.right {
right: 0;
}
</style>
</head>
<body>
<div class="box">
<div class="left"></div>
<div class="center"></div>
<div class="right"></div>
</div>
</body>
</html>
方法二、利用flex
思路：大盒子也就是父盒子设置flex，左右两边盒子给宽度，中间盒子设置flex：1
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
.box {
display: flex;
width: 100%;
height: 400px;
}
.left,
.right {
width: 100px;
height: 400px;
background-color: pink;
}
.center {
flex: 1;
background-color: oranges;
}
</style>
</head>
<body>
<div class="box">
<div class="left"></div>
<div class="center"></div>
<div class="right"></div>
</div>
</body>
</html>
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