426: updated the navbar fixing the stated bgs

[Manasi200609]

Description

This PR fixes the issue where section headings were hidden behind the fixed navbar
when navigating using navbar links.

Changes Made

• Added scroll offset so headings appear below the navbar
• Improved navigation and readability

Related Issue

Fixes #426

Type of Change

• 🐛 Bug Fix — Fixes a documented issue or incorrect behavior
• ✨ Content Enhancement — Updates or improves existing content
• ✍️ New Content — Adds new chapters, examples, or significant sections
• 🛠️ Other — Please describe in the Description of Changes section

Additional Notes (Optional)

Checklist

• I have searched open pull requests to avoid duplicates.
• I have built the book locally using the build instructions and verified my changes work as expected.
• I have written clear, conventional commit messages.
  Note: This change is CSS-only and does not affect build configuration.

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[dineshkolhe1]

Hello @Manasi200609 👋

I hope you’re doing well. I’m currently exploring the organization and working on understanding the codebase. I wanted to ask for your guidance on the best way to proceed.

[Manasi200609]

Hello @dineshkolhe1 👋
Thanks for reaching out. I’m currently working on this PR and exploring the codebase as well. I’ll update the PR if there are any changes or insights as I proceed. Appreciate your message!

[github-actions]

This pull request has been inactive for 30 days. It will be closed in 14 days if no further activity occurs.

[dineshkolhe1]

@AR21SM .

Hi Maintainers 👋

I hope you're doing well.

I just wanted to kindly follow up on this PR which addresses Issue #426 (section headings being hidden behind the fixed navbar during navigation).

I have implemented the scroll offset fix and tested the changes locally to ensure that headings now appear correctly below the navbar without affecting the existing layout or build configuration.

Whenever you have some time, I would really appreciate it if you could review this PR and let me know if any changes or improvements are needed from my side. I’d be happy to work on further refinements based on your feedback.

Looking forward to your valuable suggestions.

Thank you 🙂