老师请问这样写对吗？

来源：2-4 编程练习

南方记忆

2019-06-04 19:18:26

<!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;
        }
        .main .toplayer{
            position: absolute;
            top:0;
            left:0;
            width: 380px;
            height:240px;
            opacity:0.5;
            z-index:1;
            background-color: black;
        }
        /*此处写代码*/
        
    </style>
</head>
<body>
<nav>
</nav>
    <div class="main">
        <img src="http://climg.mukewang.com/58f829ca00010be703840240.jpg">
        <div class="toplayer"></div>
    </div>
    <!-- 此处写代码 -->
    
</body>
</html>

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