QR Scan Page using HTML and CSS

What are you most proud of, and what would you do differently next time? Iam proud of this HTML code

 
    
      
        
      
      
        
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What challenges did you encounter, and how did you overcome them?

Durinng the project completion I have encountered a problem with the layout of the page. I tried to revise the topic of CSS flexbox to overcome this problem.

What specific areas of your project would you like help with?

Is it can be developed in the area of the background container?