QR code component using html and css

Here are my Questions, I would really appreciate your feedback

Overall Structure and Organization: Is the overall structure of my webpage well-organized and logical? Are there any best practices for structuring HTML and CSS that I should be following?

Semantic HTML: Am I using semantic HTML elements appropriately to represent the content? Are there places where I could use more specific HTML elements for better semantics?

CSS Styling: Is my CSS code well-structured and organized? Are there any redundant or unnecessary styles in my CSS? How can I improve the readability and maintainability of my CSS?

What resources or tutorials would you recommend for me to improve my HTML and CSS skills?

Are there specific topics or concepts I should focus on for my next challenge