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来源：2-4 编程练习

nnnumpy

2019-11-11 21:21:29

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">	
	<title>CSS布局</title>
	<style type="text/css">
		*{
			margin: 0;
			padding:0;
		}
		img{
			width: 380px;
			height: 240px;
		}
		/*此处写代码*/
		.toplayer{
		    width:380px;
		    height:240px;
		    position:absolute;
		    left:0;
		    top:0;
		    background-color:#000;
		    opacity:0.5;
		}
		
	</style>
</head>
<body>
<nav>
</nav>
	<div>
		<img src="http://climg.mukewang.com/58f829ca00010be703840240.jpg">
		<div class="toplayer"></div>
	</div>
	<!-- 此处写代码 -->
	
</body>
</html>

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