New Scrollbar with style

[zalabhavy]

Description

Added stylish scrollbar looks good in darkmode and lightmode.
No need to make changes in mode change in scrollbar.

Fixes: #344

Type of change

• Bug fix (non-breaking change which fixes an issue)
• 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:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

ATTACH SCREEN-SHOTS / DEPLOYMENT LINK

[github-actions]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, please ensure that your changes align with our CONTRIBUTING.md. If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊

[zalabhavy]

@sk66641 Please check it and merge !

[zalabhavy]

@sk66641 Please check my PR when you will be free !

Thank you !