update registeration form

[Gimhani2000]

No description provided.

[Gimhani2000]

I updated registration form to fix this issues
Navbar Centering: The justify-content: center; in .navbar centers the navbar items. Each link is padded and has a hover effect for a better UI.
Registration Form Styling: The form has a flexible layout with centered labels, a shadowed container, and padding for readability.
Responsive Container: The container’s max-width ensures it’s readable on larger screens and adapts on smaller screens.