css 居中 一个。

源码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body style="width: 100%;height: 100%;">

    <div class="box">
    </div>
  
    <style>
        .box {
            width: 500px;
            height: 300px;
            position: absolute;
            top: 50%;
            left: 50%;
            margin-left: -250px;
            margin-top: -150px;
            background-color: red;
        }
    </style>
</body>

</html>

 

posted @ 2022-04-12 17:14  小七要走  阅读(41)  评论(0)  编辑  收藏  举报