1
Two-dimensional control: Manage both rows and columns simultaneously.
2
Precise placement: Position items using grid lines, areas, and spans.
3
Simplifies complex layouts: Reduces the need for floats or nested containers.
4
Responsive design: Easily adjust column and row sizes using fractions (fr), percentages, or auto.
5
Alignment: Use justify-items, align-items, justify-content, and align-content for precise alignment.

Example: Basic CSS Grid

Difficulty: 5/10

Topics: grid layout, responsive design, fallback strategies

0-2 years experience

1
We need a simple two‑column layout where the sidebar is 250px wide and the main content fills the remaining space. How would you achieve that using CSS Grid?
2
If you set grid-template-columns: 1fr 2fr; on a container with three child items, what layout do you expect and why?
3
You have a grid with grid-template-rows: repeat(2, 100px); and you add a fourth item. Where does it end up in the grid?

2-5 years experience

1
Our product page uses a CSS Grid to arrange product cards. When we add a new card, the layout breaks on mobile. Walk me through how you'd debug the issue.
2
We want the header to span the full width while the main area uses a 3‑column grid that collapses to a single column at 600px. How would you implement that, and what trade‑offs do you consider?
3
Explain why enabling grid-auto-flow: dense; might cause items to appear out of source order, and when you would choose to use it.

5-8 years experience

1
Our dashboard component is built with nested CSS Grids, and we notice performance lag during window resize. How would you investigate and improve the rendering performance?
2
We need to support a legacy codebase that uses floats for layout, but we want to migrate to CSS Grid gradually. Describe a strategy to refactor components without breaking existing pages.
3
When designing a responsive email template, what limitations of CSS Grid do you need to account for, and how would you provide graceful fallbacks?

8+ years experience

1
Our organization is planning a UI redesign across dozens of micro‑frontends. How would you standardize the use of CSS Grid in a design system to ensure consistency, theming, and maintainability?
2
Consider a large e‑commerce site with thousands of product pages, each using custom grid layouts. What architectural decisions would you make to enable a centralized grid configuration and reduce CSS duplication?
3
How would you evaluate the trade‑offs of adopting CSS Grid versus a component library's layout system when scaling to multiple teams and platforms?