CSS Grid, Flexbox, SCSS, JS form validation

Took my time to finish this challenge, as I had not been using SCSS in a long time and had to get accostumed to it again.

Most important error I commited: planned the entire project from the beginning, except for the js form validation error message, which is now not positioned properly on all possible screen sizes. Takeaway: ALWAYS plan the entire project from the beginning, leave nothing out. This will save you a lot of time!

All feedback is much appreciated :)

Happy Coding!