QR Code component (html & css)

Nice job on tackling the project! Regarding your first question about HTML organization, overall, your structure seems well-organized. However, I'd recommend considering the BEM (Block Element Modifier) methodology for naming classes. BEM provides a standardized way to name and structure your classes, making your code more maintainable and readable. It helps in avoiding naming conflicts and provides clarity about the purpose of each element. It's a good practice to adopt such naming conventions to enhance the structure and maintainability of your HTML and CSS.

As for your second question about choosing the right size unit, don't worry too much; it's a common concern for many developers. You mentioned using 'rem,' which is a good choice most of the time! :)

Nice job :)