Is CSS important for frontend interviews?

Yes — layout, responsiveness, specificity and accessibility come up regularly. Neglecting CSS costs easy points.

What CSS depth do I need?

Solid Flexbox and Grid, the box model, specificity, positioning, responsive techniques and accessibility basics.

CSS Interview Questions and Answers

Short answer

CSS is tested more than React-only candidates expect. Here are the questions that come up and how to answer them well.

What is the box model and box-sizing?

Every element is content + padding + border + margin. By default width sets only content; border-box makes width include padding and border. Apply box-sizing: border-box globally — the most useful reset.

Flexbox vs Grid?

Flexbox is one-dimensional (a row or column); Grid is two-dimensional (rows and columns at once). Flexbox for navbars/toolbars, Grid for page layouts and card galleries.

How does specificity work?

Think (inline, ids, classes, elements). Compare left to right; the first column that differs wins. Keep specificity low and flat (single classes); avoid !important, which signals a specificity problem.

This is 1 of 200+ questions in the Complete Frontend Kit

Get every question with detailed answers, follow-ups and real code — plus coding challenges and a last-minute revision sheet. One-time payment, instant access.

⚡ Get the Complete Frontend Kit → ₹499

Explain position values.

static (default), relative (offset without leaving flow, a positioning context), absolute (relative to nearest positioned ancestor), fixed (relative to viewport), sticky (relative until a scroll threshold, then fixed).

Why doesn't my z-index work?

z-index only works within the same stacking context and on positioned/flex elements. transform, opacity < 1 and filter create new stacking contexts a child can't escape — the cause of most z-index bugs.

How do you center a div?

Flexbox: display:flex; justify-content:center; align-items:center. Grid: display:grid; place-items:center — the shortest way.

Frequently asked questions

Is CSS important for frontend interviews?: Yes — layout, responsiveness, specificity and accessibility come up regularly. Neglecting CSS costs easy points.
What CSS depth do I need?: Solid Flexbox and Grid, the box model, specificity, positioning, responsive techniques and accessibility basics.

This is 1 of 200+ questions in the Complete Frontend Kit

Get every question with detailed answers, follow-ups and real code — plus coding challenges and a last-minute revision sheet. One-time payment, instant access.

⚡ Get the Complete Frontend Kit → ₹499