这段代码用z-index不起作用呢

来源：2-7 编程练习

无根鸟飞呀飞

2019-06-10 19:42:16

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
    *{
        padding: 0;
        margin: 0;
    }
        .blue{
            width: 100px;
            height: 100px;
            background: blue;
            /*在此处添加相应代码*/
            position: relative;
            top: 50px;
            left: 30px;
            z-index: 1;
        }
        .red{
            width: 100px;
            height: 100px;
            background: red; 
            z-index: 2;  
        }
    </style>
</head>
<body>
    <div class="blue"></div>
    <div class="red"></div>
</body>
</html>

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