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<!DOCTYPE html> <html> <head> <title>Заголовок документа</title> <style> #big-box{ width: 200px; height: 200px; background-color: #666666; display: flex; align-items: center; justify-content: center; -webkit-align-items: center; } #small-box{ width: 100px; height: 100px; background-color: #8ebf42; } </style> </head> <body> <h2>Центрирование контента</h2> <div id="big-box"> <div id="small-box"></div> </div> </body> </html>