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Was there a better way to center the card in the page without having to use a margin?

Learned a lot with this project, such as the use of % instead of px when it comes to container sizing and making it responsive.

I'd like to know if there's a better/more efficient way of writing the code and the css than what I had done. The limited knowledge I do have, I did it in a way that made sense to me, but open to suggestions for future projects.