fix: navbar stays above page content by increasing z-index (#271)

[Nishika10]

Notes for Reviewers

This PR fixes #271.

What was happening

The Tutorial and Learn More buttons were appearing above the Navigation bar while scrolling.

Fix

Added a high z-index (9999) to the NavigationContainer component in Navigation.styles.js, ensuring the navbar always stays above all content.

Signed commits

• [ x] Yes, I signed my commits.

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[gemini-code-assist]

Summary of Changes

Hello @Nishika10, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a visual layering issue where certain page elements were incorrectly appearing on top of the navigation bar during scrolling. By adjusting the z-index of the navigation component, the fix ensures that the navigation bar maintains its intended position at the forefront of the page layout, improving the user experience and visual consistency.

Highlights

• Navbar Visibility: The navigation bar now consistently remains above other page content, such as the Tutorial and Learn More buttons, during scrolling.

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[gemini-code-assist]

Code Review

This pull request addresses a stacking issue where some page elements were appearing over the navigation bar. The fix increases the z-index of the navigation header, which is an effective solution for the immediate problem. My review includes a suggestion to improve the long-term maintainability of the CSS by avoiding 'magic numbers' for z-index and instead managing them through theme constants. This approach will make the application's stacking context more predictable and easier to manage as the project grows.

[gemini-code-assist]

While using a high z-index value solves the immediate problem, using a 'magic number' like 9999 can lead to maintainability issues. It's a common source of 'z-index wars' where values are incrementally increased to resolve stacking conflicts, making the CSS difficult to manage over time.

A better practice is to abstract this value into a constant. Since you're using styled-components, a good place for this would be in your theme object (e.g., in index.style.js). This provides a single source of truth for stacking layers in your application.

For example:

// in your theme file
const zLevels = {
  navbar: 1000,
  modal: 2000,
};

export const lightTheme = {
  // ...
  zIndex: zLevels,
  // ...
};

Then, you could use it here like so: z-index: ${({ theme }) => theme.zIndex.navbar};. This makes the intent clearer and the system more maintainable.

[saurabhraghuvanshii]

@Nishika10 can you address this

[Nishika10]

Sure, I’ll address this and update it accordingly.

[kishore08-07]

@Nishika10 Could you please add before/after images or videos? That would help ease the review process.

[Nishika10]

@kishore08-07 Sure, I'll add the images.

[Nishika10]

Hi @kishore08-07
Added before/after visuals for clarity.

Before: The Navbar was overlapped by the Tutorial / Learn More buttons while scrolling.
After: Navbar stays above all page content as expected.

Before:

After:
https://github.com/user-attachments/assets/4bed8572-2e0a-4e00-98e8-b081d1f7db31

[kishore08-07]

Thanks @Nishika10, LGTM!