HTML, Sass, and JavaScript responsive signup form

Hello, For this project I aimed to utilize more responsive units (rems in this case).

I am calculating them on the fly using a Sass function. If you notice any improvements that could have been made in regards to Sass and responsive units feel free to let me know.

This time I also developed in the order of Mobile -> Tablet -> Desktop with more of an emphasis on making sure the design remained acceptable during resizes etc. If you have any design approach suggestions I am all ears.

Also anything else that stands out don't hesitate to point it out. I'd really appreciate it.

Thanks everyone