How do you center a div horizontally and vertically?

Short answer: Using Flexbox: .parent { display: flex; justify-content: center; /* horizontal */ align-items: center; /* vertical */ height: 100vh; } Key Takeaway: flexbox is the easiest and modern way to center elements.

Real-world example (ShopNest)

ShopNest’s browser cart uses modern JavaScript: fetch APIs with async/await, modules, and clear error handling.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.