Title: Let's add a CUSTOM SCROLLBAR

[mehrun171]

Which pre-existing JavaScript project will you be working on?

whole webiste

Describe your enhancement/improvement

We can add a custom scroll bar to the website to improve the UI of website visibility

Anything you need to say to the Reviewers

No response

Add any other context or relevant screenshots about the enhancement here.

No response

[mehrun171]

Please assign me this issue @swapnilsparsh

[vermagithubcs]

Please assign me this issue and I make a custom scrollbar @swapnilsparsh Sir!