CODE CHANGE: The nav bar is clearly invisible when it comes to white background

[RahulScripted]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the code change

Nav bar is not showing

Proposed solution

I want to add a shadow on navBar so that it is easily visible for any section

Record

• [X] I agree to follow this project's Code of Conduct
• [X] I'm a GSSOC'24 contributor
• [X] I want to work on this issue

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[Samar-Ali-Ansari]

I will surely work on it and fix it