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I used just html for the form validation since its already integrated. I didn't see any particular benefit on doing it through javascript, maybe someone can clarify that for me? What's the point on validating through js if it can be done with html and the browser?

Beginner here. It was impossible for me to make the site responsive, I know how to make a site shrink or expand according to the viewport but I found no way of changing the site completely when the user is on mobile, like the exercise asks to do.

If anyone can please help me with that I would be extremely grateful.