代码示例:(标识:css_transparency)
<!DOCTYPE html>
<html>
<head>
<style>
div.background {
  background: url(/static/demo/images/tulip_peach_blossom_s.jpg) repeat;
  border: 2px solid black;
}

div.transbox {
  margin: 30px;
  background-color: #ffffff;
  border: 1px solid black;
  opacity: 0.6;
}

div.transbox p {
  margin: 5%;
  font-weight: bold;
  color: #000000;
}
</style>
</head>
<body>

<div class="background">
  <div class="transbox">
    <p>这段文本被放置在一个透明框中。</p>
  </div>
</div>

</body>
</html>
运行结果: