Made ui changes to the navbar

[theseus-alt]

The following changes were made to the navbar:

• Made it sticky for better visual appeal.
• Made the transitions smoother and a subtle drop-shadow effect for a 3D look.
• Minor padding and margin adjustments

Thanks!

[ranodeepbanerjee]

@theseus-alt kindly star the repository.

[theseus-alt]

sure!

[theseus-alt]

@ranodeepbanerjee kindly add the appropriate label for hacktoberfest. thanks!