js固定悬浮窗口顶部

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Fixed Floating Window</title>
    <style>
        .fixed-top {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: #333;
            color: #fff;
            padding: 10px 20px;
            text-align: center;
            z-index: 1000; /* 确保元素在最上层 */
        }
    </style>
</head>
<body>
    <div class="fixed-top">
        This is a fixed floating window at the top.
    </div>
    <div style="height: 2000px;">
        <!-- 页面内容 -->
    </div>
</body>
</html>

.content {
    padding-top: 50px; /* 根据悬浮窗口的高度调整 */
}

@media (max-width: 768px) {
    .fixed-top {
        width: 100%;
        padding: 10px;
    }
}

.fixed-top {
    transition: all 0.3s ease; /* 平滑过渡效果 */
}