div嵌套div标签 里层的div透明属性
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<style type="text/css">
div{
border: 1px solid red;
}
#one{
background-color:black;
width: 300px;
height: 300px;
}
#two{
background-color:white;
width: 100px;
height: 100px;
opacity:0.7;
}
</style>
</head>
<body>
<div id="one" >
<div id="two" >
</div>
</div>
</body>
</html>
