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<!DOCTYPE html> <html> <head> <title></title> <style> *{text-align: center; background-color: seagreen; color: white; font-size: 20px; } </style> </head> <body> <h1>This is first heading</h1> <p>This is paragraph</p> <h3>This is third heading</h3> <h2>This is second heading</h2> </body> </html>