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<!DOCTYPE html> <html> <head> <title>Title of the document</title> <style> #wrapper { width: 100%; height: 300px; border: 2px solid #000; display: flex; align-items: center; justify-content: center; } button { height: 30px; width: 90px; } </style> </head> <body> <div id="wrapper"> <button type="button">W3Docs</button> </div> </body> </html>