trycss_cen_7 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>
    #ex3_container{
    width:200px;
    height:200px;
    background-color:yellow;
    position:relative;
    }
    #ex3_content{
    left:50%; top:50%; 
    transform:translate(-50%,-50%);
    -webkit-transform:translate(-50%,-50%);
    background-color:gray; color:white; position:absolute;
    }
</style>
<body>
    <div id="ex3_container"><div id="ex3_content">你好 w3cschool</div></div>
</body>
 
 
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运行结果
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