三栏布局

<!-- <!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>绝对定位</title>
    <style>
        body {
            margin: 0;
            width: 100%;
        }
        
        header,
        footer {
            position: absolute;
            top: 0px;
            background: red;
            height: 100%;
        }
        
        header {
            left: 0;
            width: 100px;
        }
        
        footer {
            right: 0px;
            width: 200px;
        }
        
        section {
            margin: 0px 100px 200px 0px;
            height: 100%;
            background: blue;
        }
    </style>
</head>

<body>
    <header>Left</header>
    <section>Main</section>
    <footer>Right</footer>
</body>

</html> -->

<!-- <!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>圣杯布局</title>
    <style>
        html {
            height: 100%;
            padding: 0;
            margin: 0
        }
        
        body {
            padding-left: 100px;
            padding-right: 200px;
        }
        
        header {
            background: red;
            width: 100px;
            float: left;
            margin-left: -100%;
            position: relative;
            left: -100px;
            height: 100%;
        }
        
        footer {
            background: red;
            width: 200px;
            height: 100%;
            float: left;
            margin-left: -200px;
            position: relative;
            right: -200px;
        }
        
        section {
            background: blue;
            width: 100%;
            height: 100%;
            float: left;
        }
    </style>
</head>

<body>
    <header>Left</header>
    <section>Main</section>
    <footer>Right</footer>
</body>

</html> -->

<!-- <!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>双飞翼布局</title>
    <style>
        html {
            height: 100%;
            padding: 0;
            margin: 0
        }
        
        body {
            padding-left: 100px;
            padding-right: 200px;
        }
        
        header {
            background: red;
            width: 100px;
            float: left;
            margin-left: -100%;
            position: relative;
            left: -100px;
            height: 100%;
        }
        
        footer {
            background: red;
            width: 200px;
            height: 100%;
            float: left;
            margin-left: -200px;
            position: relative;
            right: -200px;
        }
        
        section {
            background: blue;
            width: 100%;
            height: 100%;
            float: left;
        }
    </style>
</head>

<body>
    <header>Left</header>
    <section>Main</section>
    <footer>Right</footer>
</body>

</html> -->

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>浮动布局</title>
    <style>
        html,
        body {
            height: 100%;
            padding: 0;
            margin: 0
        }
        
        header {
            background: red;
            width: 100px;
            float: left;
            height: 100%;
        }
        
        footer {
            background: red;
            width: 200px;
            float: right;
            height: 100%;
        }
        
        section {
            background: blue;
            height: 100%;
            margin: 0px 100px 200px 0px;
        }
    </style>
</head>

<body>
    <header>Left</header>
    <footer>Right</footer>
    <section>Main</section>
</body>

</html>