Update Scroll Bar for Better Aesthetic and Usability

[aparna-44]

The current scroll bar on the Secrets website appears basic and lacks customization, which doesn't align with the overall aesthetic. I propose enhancing the scroll bar by:

Changing the color scheme to match the site's design
Customizing the thickness and style to make it more modern and sleek
Implementing smoother scrolling for a better user experience
This enhancement will improve the visual appeal of the site and make navigation more intuitive.

@Kritika30032002 plz assign me this issue, i really want to work on it.

[github-actions]

Hey, @aparna-44 welcome to Top_Secrets repository.🎊 Thank you so much for taking the time to point this out.🙌