Huddle landing page with a single introductory section

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

It's my first project with html and css, I think I've managed to do 80% of what was proposed. But I'm happy with the end result.

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

I had a hard time making the site responsive, but I think I've solved the problem to some extent.

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

Constructive criticism, tips or anything that can help me improve would be greatly appreciated!