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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> .container { background-color: red; position: relative; width: 100%; padding-top: 100%; /* 1:1 Aspect Ratio */ } .text { position: absolute; top: 0; left: 0; bottom: 0; right: 0; text-align: center; font-size: 20px; color: white; } </style> </head> <body> <h2>Maintain Aspect Ratio 1:1</h2> <p>Resize the window to see the effect.</p> <div class="container"> <div class="text">1:1 Aspect ratio</div> </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>