Simple information website with basic HTML and CSS

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

• Spending 30 minutes to do this, I feel satisfied at the beauty of it
• Feel like my HTML and CSS has improved from the last time

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

First, I still can't figure out how to "actually center a div" but searching the web helps me a lot, I learned new things too!

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

I think there are nothing to help with but if you can, please change anything if possible!