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

I'm happy to continue doing the challenges

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

the "margin: 10vh auto" didn't work for me to cauterize the elements horizontally, since i used "max-width: 21vw" both in "body" and "main" .. so after using non-responsive units, every thing works (e.g with max-width: 320px)

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

when should we use responsive and we shouldn't use? besides that, there's a lot of facilities to achieve responsiveness in css, and honestly I'm not sure where and when I need to use them!