Added custom scroll bar

[Amruta7203]

Pull Request Template

Description

added a custom scroll bar compatible with the theme of the website

Fixes #72

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• [x ] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• [x ] My code follows the style guidelines of this project
• [x ] I have performed a self-review of my own code
• [x ] I have commented my code, particularly in hard-to-understand areas
• [x ] I have made corresponding changes to the documentation
• [x ] My changes generate no new warnings
• [x ] I have added tests that prove my fix is effective or that my feature works
• [x ] New and existing unit tests pass locally with my changes
• [x ] Any dependent changes have been merged and published in downstream modules

Screenshots (if applicable):

Add any screenshots of your changes, if applicable.

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[Amruta7203]

@singhJasvinder101 Pls review and merge this PR

[Amruta7203]

@singhJasvinder101 Pls review and merge this PR