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<!DOCTYPE html> <html> <head> <title>Title of the document</title> <style> #wrapper { width: 100%; height: 400px; border: 2px solid #000; } button { height: 20px; position: relative; margin: -20px -50px; width: 100px; top: 50%; left: 50%; } </style> </head> <body> <div id="wrapper"> <button type="button">W3Docs</button> </div> </body> </html>