css中把flash设置透明

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Flash Transparency</title>
    <style>
        .flash-container {
            width: 300px;
            height: 200px;
            background-color: rgba(255, 255, 255, 0.5); /* 半透明背景 */
            position: relative;
        }
        .flash-object {
            width: 100%;
            height: 100%;
            background-color: red; /* 示例颜色 */
            opacity: 0.5; /* 设置透明度 */
        }
    </style>
</head>
<body>
    <div class="flash-container">
        <div class="flash-object"></div>
    </div>
</body>
</html>