Responsive Signup Form with JS validation while typing and submitting

Hello Everyone!😊

I made this site using HTML, CSS and Vanilla JS with Live Input Validation! It validates while user is typing and also when Form is Submitted. I Used REGEX and JS for Email and Password Validation.

My CSS is messy. I learned that, I should have used rem for font sizing em for padding, margins, etc.

Please drop your feedback and check my other solutions too.