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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>
- * {
- margin: 0;
- padding: 0;
- }
- html,body {
- width: 100%;
- height: 100%;
- }
- #box {
- width: 200px;
- height: 200px;
- background: #f00;
- position: absolute;
- top: 50%;
- left: 50%;
- margin-top: -100px;
- margin-left: -100px;
- }
- </style>
- </head>
- <body>
- <div id="box"></div>
- </body>
- </html>
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