Recipe Page design with basic HTML and CSS

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

This is my first time working with responsive web design, so I think I should feel proud of this being quite close to the expected outcome.

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

Most of the difficulties I encountered comes from my lack of understanding and experience in CSS, but after a bit of searching and testing, it came out satisfactory.

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

I am still wondering about the best way to design dynamic web layout, should I use px or em and rem? Are there any standard that I should follow when creating responsive web design?