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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- <style>
- .box{
- width: 400px;
- height: 400px;
- border: 5px solid black;
- position: relative; /* 设置为相对定位 */
- }
- .div1{
- width: 200px;
- height: 200px;
- background-color: blue;
- /* margin: 0 auto; 水平居中
- margin-top: 100px; */
- position: absolute;
- left: 50%;
- top: 50%;
- margin-top: -100px;
- margin-left: -100px;
- }
- </style>
- </head>
- <body>
-
- <div class="box">
- <div class="div1"></div>
- </div>
- </body>
- </html>
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