tryss_cen_17 在线代码实例

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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>编程狮(w3cschool.cn)</title>
<style>
    .parent {
     position:relative;
     margin:0 auto;
     width:200px;
     height:200px;
     background-color:red;
    }
    .children {
     position:absolute; 
     left:50%; 
     top:50%; 
     margin:-25px 0 0 -25px ;
     height:50px;
     width:50px;
     background-color: black;
    }
</style>
<body>
    <div class="parent">
      <div class="children"></div>
    </div>
</body>
 
 
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运行结果
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