trycss_cen_2 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{
     margin:0 auto;
     width:200px;
     height:200px;
     background-color:red;
    }
    .children {
     width: 100px;
     height: 100px;
     padding: 50px;
     background-color: black;
     background-clip:content-box;/*居中的关键*/
</style>
<body>
    <div class="parent">
        <div class="children"></div>
    </div>
    
</body>
 
 
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运行结果
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