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<!DOCTYPE html> <html> <head> <style> .center { margin: auto; width: 50%; border: 3px solid #73AD21; padding: 10px; } </style> </head> <body> <h2>Center Align Block Elements</h2> <p>Use margin: auto to horizontally center a block-level element:</p> <div class="center"> <p>This div element is centered.</p> </div> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>