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<!DOCTYPE html> <html> <head> <style> .button { background-color: #4CAF50; /* 绿色 */ border: none; color: white; padding: 20px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 2px; cursor: pointer; } .button1 {border-radius: 2px;} .button2 {border-radius: 4px;} .button3 {border-radius: 8px;} .button4 {border-radius: 12px;} .button5 {border-radius: 50%;} </style> </head> <body> <h1>圆角按钮</h1> <p>通过 border-radius 属性为按钮添加圆角：</p> <button class="button button1">2px</button> <button class="button button2">4px</button> <button class="button button3">8px</button> <button class="button button4">12px</button> <button class="button button5">50%</button> </body> </html>