Responsive QR code component using CSS nesting

What are you most proud of, and what would you do differently next time?

Completing this QR code component challenge using what I've learned through studying HTML & CSS so far is something I am most proud of. My goal next time would be to complete this challegen using even less (but important) HTML tags & CSS properties/declarations.

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

The biggest challenge I've discovered was trying to center the entire card element vertically and horizontally. It is something personally, I've never done before but always wondered, how?

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

The figma design document includes a category called Spacing with some units and measurements included. I was unsure what this entire section means. Does it mean spacing between the image, heading, and paragraph elements? The spacing between the entire card element in accordance with the current screen size (like it should have this spacing on mobile, tablet, and desktop)? I'm just not sure.