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

It's my first time using the @media query, I didn't know about this responsiveness technique until today!

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

I had an issue with the mainContainer element (basically the whole background) growing only as big as the content, although I gave it the style "height: 100%". Then I found out, I'd have to set the style "html,body{ height: 100% }" for the mainContainer to inherit the height.

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

1. Is it usual to use style "html, body{ height: 100% }"? I have a personal project I've worked on where I didn't use this style and it still worked.
2. When should I use the max-width property and when the min-width property in the @media query?