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flexbox-css-flexbox

CSS Flexbox

Last reviewed May 28, 2026 Content v20260528
Track mode
iframe_html
Means
HTML preview sandbox
Reading
~1 min
Level
intermediate

This lesson

This lesson teaches CSS Flexbox—the ideas, syntax, and habits you need before moving on in CSS.

Most modern layouts are built with flexbox and grid; skipping this lesson leaves responsive UI fragile.

You will apply CSS Flexbox in contexts like: Page layouts, dashboards, marketing sections, and component libraries.

Read the lesson, edit HTML/CSS in the playground, press Run to preview, then answer the lesson MCQs.

Toward the end of the track—use it to consolidate patterns before the capstone or summary lessons.

Flexbox solves one-dimensional layout problems: alignment and distribution along a row or column.

When to choose flexbox

  • Navigation bars and toolbars.
  • Card header/footer alignment.
  • Button groups and responsive wrapping rows.

Important interview questions and answers

  1. Q: Flexbox vs Grid in one sentence?
    A: Flexbox is one-dimensional; Grid handles two-dimensional track layouts.
  2. Q: Why use gap in flex?
    A: Cleaner spacing without child-margin hacks.
  3. Q: Common flex bug?
    A: Content overflow due to missing min-width handling.

Challenge

Center a card

  1. Use flex parent with justify-content:center and align-items:center.

Done when: card is centered in the preview area.

Interview tip Lesson completion confidence

Can you explain this lesson in 30 seconds without reading notes?

Not saved yet.

Playground

Runs in your browser in a sandboxed frame. Backend runners appear when this track’s profile allows them.

Check yourself

Multiple choice — immediate feedback.

Discussion

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Starter discussion topics

  • What part of this lesson needs a second read?
  • What would you try differently in a real project?

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