Intro component with a signup form

I'm glad to be able to submit a solution to this challenge, but my solution is not quite finished:

• There is a big empty space below the "First name can't be empty", I managed to fix it once but it comes back so I don't know how to fix it (maybe with some margin?

• I don't know how to style the placeholder content "email@example/com" only when the form is submitted, so how can I do that?

• Is it very important to have a <label> element on all forms, because on this challenges it seems to be useless.

Have a nice day !