navbar fixed at top

[Shreesanyog]

Description

I addressed the issue by ensuring that the navigation bar remains fixed at the top of the page even when scrolling down. This enhancement improves user experience by providing easy access to navigation options throughout the website.

Fixes #78

Type of PR

• Bug fix

Screenshots

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Checklist:

• I have performed a self-review of my code
• I have read and followed the Contribution Guidelines.
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers, screenshots after making the changes.
• I have commented my code, particularly in hard-to-understand areas.

Please consider merging this pull request. Thank you!