我这样可以吗？

来源：2-4 编程练习

慕先生3246696

2019-07-25 15:19:29

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
    /*完善下列代码*/
    .per{
     width: 300px;
     height: 300px;
     background: red;
     margin-left:200px;
     margin-top: 200px;
   }

   .son{
     width: 100px;
     height: 100px;
     background: blue;
     position:relative;
     top:100px;
     left:100px;
   }
</style>
</head>
<body>
<div class="per">
    <div class="son"></div>
</div>
</body>
</html>