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CSS Property Value - 如何background-color: rgba(30,0,0,0.1);

background_color

【background_color】

我们想知道如何background-color: rgba(30,0,0,0.1);


<!DOCTYPE html>
<html>
<head>
<title>Recursive background</title>
<style type='text/css'>
body * {
  background-color: rgba(30, 0, 0, 0.1);
}
</style>
</head>
<body>
  <div>
    Bla
    <div>Blargh</div>
    <div>
      Bla <a href="#">blargue</a>
    </div>
  </div>
</body>
</html>