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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 #f00;
- border-color: transparent transparent transparent red;
- /*
- transparent 透明
- border-color: 上 右 下 左;
- */
- }
- </style>
- </head>
- <body>
- <!--
- css三角形
- -->
- <div></div>
- </body>
- </html>
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