div css结构代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Div CSS Example</title>
    <style>
        .container {
            width: 80%;
            margin: 0 auto;
            background-color: #f0f0f0;
            padding: 20px;
            border: 1px solid #ccc;
        }
        .header {
            background-color: #333;
            color: #fff;
            padding: 10px;
            text-align: center;
        }
        .content {
            padding: 20px;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">Header</div>
        <div class="content">
            <p>This is the content area.</p>
        </div>
    </div>
</body>
</html>

<link rel="stylesheet" href="styles.css">

/* 确保选择器正确 */
.container {
    width: 80%;
    margin: 0 auto;
    background-color: #f0f0f0;
    padding: 20px;
    border: 1px solid #ccc;
}