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<!DOCTYPE html> <html> <head> <style> div { background-color: green; color: white; padding: 25px; text-align: center; } div:hover { background-color: blue; } </style> </head> <body> <p>将鼠标悬停在下面的 div 元素上以更改其背景颜色：</p> <div>鼠标悬停在我身上</div> </body> </html>