css自适应高度

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS自适应高度示例</title>
    <style>
        .container {
            height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .header {
            background-color: #f1f1f1;
            padding: 20px;
            text-align: center;
        }
        .content {
            flex-grow: 1;
            background-color: #ddd;
            padding: 20px;
            text-align: center;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">Header</div>
        <div class="content">
            <p>这是一个自适应高度的内容区域。</p>
            <!-- 添加更多内容以测试自适应高度 -->
        </div>
    </div>
</body>
</html>