Fixed position fo Title in Sign-up and Sign-in pages

[LucyChyzhova]

Description

I fixed the title position on Sign up and Sign in pages Changed name of CSS file from SignUp.css to SignUp.style.css

Fixes #265

How to test?

bu run npm run dev

Checklist

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] This PR is ready to be merged and not breaking any other functionality

[LucyChyzhova]

I'm sorry, I Attached the wrong file. This from the sign-in page: