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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> .btn { background-color: #ddd; border: none; color: black; padding: 16px 32px; text-align: center; font-size: 16px; margin: 4px 2px; transition: 0.3s; } .btn:hover { background-color: #3e8e41; color: white; } </style> </head> <body> <h2>渐隐按钮 - 背景淡入</h2> <button class="btn">在我上方悬停</button> </body> </html>