[style]: Add stylish Scrollbar

[piyushkhurana2019]

What's the style idea?

We need to improve:- The website UI is very beautiful, just there is one thing which can enhance its beauty to a great extent that is scroll bar.
I want to add a stylish scroll bar to the website so that it looks more eye catching to the users
either this:-

or this

Add screenshots

Add screenshots

Code of Conduct

• I agree to follow this project's Code of Conduct
• I have read the Contributing Guidelines
• I agree to follow this project's Code of Conduct
• I'm a GSSoC'23 contributor
• I want to work on this issue

[github-actions]

👋 @piyushkhurana2019

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[GriffinAnnshual]

Hey can you assign this issue to me! I would like to work on it.