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来源：2-4 编程练习

雨滴007

2019-08-02 22:39:50

<!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*/
		.zhuozhao{
			width: 380px;
			height: 240px;
			background: black;
			opacity: 0.5;
			z-index: 2;
			position: absolute;
			top: 0;
			left: 0;
		}
	</style>
</head>
<body>
<nav>
</nav>
	<div>
		<img src="http://climg.mukewang.com/58f829ca00010be703840240.jpg">
	</div>
	<!-- 此处写代码 -->
	<div class="zhuozhao">
		
	</div>
	
</body>
</html>

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