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改变主题,夜晚/白天
<!DOCTYPE html> <html> <head> <style> #first { font-size: 40px; } #second { font-size: 20px; } </style> </head> <body> <p id="first">This is a paragraph having size 40px.</p> <p id="second">This is another paragraph having size 20px.</p> </body> </html>