Z-Index is a CSS property that controls the vertical stacking order of elements, influencing website layout, design, visibility, and usability.
What is Z-Index?
Z-Index defines how elements are layered on a webpage. Elements with higher values appear above those with lower values.
Why Z-Index Matters in SEO & UX:
- Improves user experience with clear layouts.
- Ensures navigation menus and CTAs remain visible.
- Prevents content overlap issues affecting readability.
- Helps in mobile responsiveness and design accessibility.
- Avoids hidden or blocked important content.
Examples of Z-Index Use:
- Keeping sticky headers above content.
- Ensuring pop-ups overlay the main page.
- Making dropdown menus visible above images.
- Layering banners or ads correctly.
- Preventing text from being hidden behind visuals.
Best Practices for Z-Index:
- Use minimal values to avoid conflicts.
- Keep critical elements (menus, buttons) above others.
- Test across different screen sizes.
- Avoid unnecessary large Z-index numbers.
- Ensure no SEO-impacting hidden content.
Example in Practice:
If a website’s CTA button is hidden behind an image due to poor Z-Index control, it reduces conversions and usability.
