Updated Navbar [sticky navbar, refined colors, checked responsiveness]

[piyusha-chopra]

🚀 Pull Request

🔖 Description

I have updated navbar.
Matched all the navbars colors.
Made it sticky on both light and dark mode.
Checked the responsiveness on small devices too.

Fixes: # 645

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📸 Screenshots

Before:

After:

Sticky navbar:

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✅ Checklist

• ✅ My code follows the project’s guidelines and style.
• ✅ I have tested the changes and confirmed they work as expected.
• ✅My PR is linked to a GitHub issue.

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🙌 Additional Notes

I really enjoyed working on this issue. It felt amazing to update navbar to match the design better. This PR gave me a better understanding of responsive design and color consistency across light and dark modes.

[github-actions]

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[github-actions]

🎉 Congrats on getting your PR merged, @piyusha-chopra! 🙌🏼

Thanks for your contribution every effort helps improve the project.

Looking forward to seeing more from you! 🥳✨