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<!DOCTYPE html> <html> <head> <title>Xem ví dụ</title> <style type="text/css"> #test{ padding:50px; background-color:black; opacity:0.3; } </style> </head> <body> <div id="test"> <img src="https://y2graphic.com/wp-content/uploads/2025/02/chatgpt-la-gi.jpg" style="width:400px"> </div> </body> </html>
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