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<!DOCTYPE html> <html> <head> <style> .outer-box { border: 1px solid #ccc; padding: 20px; background-color: #f9f9f9; } .inner-box { width: 200px; margin: 0 auto; background-color: #e0f0ff; padding: 10px; border: 1px solid #007bff; text-align: center; } </style> </head> <body> <div class="outer-box"> <div class="inner-box"> This element is horizontally centered using margin: 0 auto. </div> </div> </body> </html>
