要使用CSS创建透明框，您可以尝试运行以下代码
<!DOCTYPE html>
<html>
<head>
<style>
div {
background-color: #808000;
padding: 20px;
}
div.myopacity {
opacity: 0.4;
filter: alpha(opacity=80);
}
</style>
</head>
<body>
<h1>Heading</h1>
<p>Check trensparency in the below box:</p>
<div class = "myopacity">
<p>opacity 0.4</p>
</div>
<div>
<p>opacity 1</p>
</div>
</body>
</html>