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<!DOCTYPE html> <html> <head> <style> div { width: 300px; height: 200px; padding: 15px; /* set padding for all four sides */ border: 10px solid black; /* set border for all four sides */ margin: 20px auto; /* set top and bottom margin to 20 pixels, and left and right margin to auto */ } </style> </head> <body> <h2>CSS Box Model </h2> <div> My Name is Ada </div> </body> </html>