flex flex-grow、flex-shrink、flex-basis - 自学教程(runoops.com)

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0,minimum-scale=1.0,user-scalable=0" />
    <title>flex flex-grow、flex-shrink、flex-basis - 自学教程(runoops.com)</title>
    <style>
        
        * {
            margin: 0;
            padding: 0;
        }

.wrapall {
            display: flex;
            flex-direction: column;
            height: 100vh;
        }

header {
            height: 60px;
            flex: 0 0 auto;
            background-color: pink;
        }

main {
            flex-grow: 1; /* 或 flex: 1;*/
            background-color: aqua;
        }

footer {
            height: 60px;
            flex: 0 0 auto;
            background-color: lightgreen;
        }
    </style>
</head>

<body>
    <div class="wrapall">
        <header>我是header</header>
        <main>
            <p style="height:200px">我是main</p>
        </main>
        <footer>我是footer</footer>
    </div>

</body>

</html>