Intro component with sign-up form (using vanilla HTML, CSS and JS)

Decided to use vanilla HTML, CSS and JS (along with the "Five Server" VSCode plugin) for this, unlike my previous projects which have used Parcel and SASS.

I'd say this project went OK, just need to work on some skills like getting everything to remain looking good on a variety of screen sizes; for example, the error messages on mobile (i.e. variable width) were a little problematic as the only way I found to align them was to use a left margin.

All feedback welcome as always!