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<!DOCTYPE html> <html> <head> <style> .button { background-color: #4CAF50; /* Green */ border: none; color: white; padding: 15px 32px; text-align: center; text-decoration: none; display: inline-block; font-size: 16px; margin: 4px 2px; cursor: pointer; } .button2 {background-color: #008CBA;} /* Blue */ .button3 {background-color: #f44336;} /* Red */ .button4 {background-color: #e7e7e7; color: black;} /* Gray */ .button5 {background-color: #555555;} /* Black */ </style> </head> <body> <h2>按钮颜色</h2> <p>使用 background-color 属性更改按钮的背景颜色：</p> <button class="button">绿色</button> <button class="button button2">蓝色</button> <button class="button button3">红色</button> <button class="button button4">灰色</button> <button class="button button5">黑色</button> </body> </html>