CSS Grid allows you to create complex, responsive layouts without relying on floats or manual positioning. It provides a two-dimensional layout system with precise control over rows and columns.

Advantages over Floats

1
No need for clear hacks or float containment; elements are placed directly in the grid.
2
Easy to define responsive columns using fr units or auto-fit/auto-fill with minmax.
3
Vertical and horizontal alignment can be handled with align-items, justify-items, and place-items without extra wrappers.
4
Supports overlapping and layering content using grid-area for precise placement.
5
Simplifies reordering elements visually with order-like properties in the grid without changing HTML.

Example: Responsive Grid Layout

In this example, the grid automatically adapts to different screen sizes. Each item maintains a minimum width of 200px, and extra space is distributed evenly without using floats or clearing techniques.

Best Practices

1
Use grid-template-columns with auto-fit or auto-fill and minmax for responsive columns.
2
Use gap to manage spacing between items instead of margins.
3
Combine Grid with media queries for fine-tuned layout adjustments.
4
Avoid using floats for modern layouts; Grid and Flexbox provide cleaner, more maintainable code.
5
Use place-items or justify-items for simple alignment within grid cells.

Difficulty: 5/10

Topics: grid layout, responsive design, fallback strategies

Scenario Questions

0-2 years experience

1
You need to create a two‑column layout that collapses to a single column on screens narrower than 600px. How would you use display:grid to achieve this, and what CSS would you write?
2
If you replace a float‑based navigation bar with a grid, what changes do you expect in the HTML and CSS, and how does the layout behave when the viewport width changes?

2-5 years experience

1
We have a product page where the sidebar should appear on the left on desktop, but move below the main content on tablet. The existing code uses floats and is breaking on some browsers. Walk me through how you'd refactor it with CSS Grid and what debugging steps you'd take if the layout doesn't shift as expected.
2
During a sprint, a teammate added a new promotional banner inside a grid container, but the banner overlaps other items on small screens. How would you adjust the grid definitions to make the layout responsive without rewriting the whole component?

5-8 years experience

1
Our design system includes a complex card grid that needs to support up to 5 columns on large screens, auto‑flow rows on medium, and a single column on mobile, while preserving aspect ratios. Explain how you'd structure the CSS Grid template and discuss performance or maintainability concerns.
2
We are migrating a legacy codebase that heavily relies on floats for a responsive dashboard. What strategy would you use to incrementally replace floats with Grid, and how would you ensure cross‑team consistency and avoid layout regressions?

8+ years experience

1
At the organization level we plan to standardize responsive layouts across dozens of services. How would you design a CSS Grid‑based layout framework that can replace float‑based patterns, handle legacy browsers, and be extensible for future design changes?
2
Consider a scenario where multiple teams need to share a responsive grid system, but some services still need to support IE11. What trade‑offs would you make between using native CSS Grid, polyfills, or fallback float layouts, and how would you manage the migration roadmap?

Follow-up Questions

❓Why did you choose that particular grid function (e.g., auto-fit vs auto-fill)?
❓How would the layout behave if the content inside a grid item overflows?
❓What would you do to support older browsers that don’t understand CSS Grid?