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改变主题,夜晚/白天
<!DOCTYPE html> <html> <head> <style> body { font-size: 100%; } h1 { font-family: sans-serif; } h2 { font-family: serif; } p { font-family: monospace; } } </style> </head> <body> <h1>This heading is shown in sans-serif.</h1> <h2>This heading is shown in serif.</h2> <p>This paragraph is written in monospace.</p> </body> </html>