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<!DOCTYPE html> <html> <head> <style> .flex-container { display: flex; align-items: center; justify-content: center; height: 300px; border: 2px solid #666666; } .flex-item { padding: 20px; margin: 5px; background: #8ebf42; color: white; font-weight: bold; font-size: 3em; text-align: center; } </style> </head> <body> <div class="flex-container"> <div class="flex-item">1</div> <div class="flex-item">2</div> <div class="flex-item">3</div> <div class="flex-item">4</div> </div> </body> </html>