html5+css网站

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>响应式布局示例</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
        }
        .container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            padding: 20px;
        }
        .box {
            width: calc(33.33% - 20px);
            margin-bottom: 20px;
            background-color: #f0f0f0;
            padding: 20px;
            box-sizing: border-box;
        }
        @media (max-width: 768px) {
            .box {
                width: calc(50% - 20px);
            }
        }
        @media (max-width: 480px) {
            .box {
                width: 100%;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="box">Box 1</div>
        <div class="box">Box 2</div>
        <div class="box">Box 3</div>
        <div class="box">Box 4</div>
        <div class="box">Box 5</div>
        <div class="box">Box 6</div>
    </div>
</body>
</html>