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改变主题,夜晚/白天
<!DOCTYPE html> <html> <head> <style> #left { border-top-right-radius: 50%; background: lightgreen; padding: 50px; border: 6px ridge red; width: 300px; height: 200px; font-size: 25px; } </style> </head> <body> <center> <div id = "left"> <h2>Welcome to the RocSchool.com</h2> <p>border-top-right-radius: 50%;</p> </div> </center> </body> </html>