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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>
- div {
- width: 0;
- height: 0;
- border: 40px solid;
- border-color: red transparent transparent transparent;
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- </style>
- </head>
- <body>
- <div></div>
- </body>
- </html>
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