请老师帮我检查下是否正确

来源：2-4 编程练习

慕侠635704

2019-10-22 22:06:24

<!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*/
		.top{
		    width: 380px;
			height: 240px;
			background-color:#000;
			opacity:0.5;
			position:absolute;
			top:0;
			left:0;
			z-index:9999;
		}
	</style>
</head>
<body>
<nav>
</nav>
	<div>
		<img src="http://climg.mukewang.com/58f829ca00010be703840240.jpg">
	</div>
	<!-- 此处写代码 -->
	<div class="top">
	</div>
</body>
</html>

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