Layout and responsive · Lesson 10 of 14 · 7 minutes

Layout and responsive: Mobile media query

A max-width media query applies at and below its boundary; the base layout should remain usable without it.

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Your objectives

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1
Build mobile media query
Build this first target: .layout with display: grid, grid-template-columns: repeat(2,minmax(0,1fr)). Keep the selector relationships intact and inspect the preview.
Hint & worked example
A max-width media query applies at and below its boundary; the base layout should remain usable without it.
The requested selectors and declarations exist outside comments.
```
.layout { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
```
Common mistake to avoid: If the page fits one desktop viewport, no narrower viewport needs checking.
2
Extend the mobile media query example
Extend your file to include: .layout with display: grid, grid-template-columns: repeat(2,minmax(0,1fr)); @media(max-width:40rem) — .layout with grid-template-columns: 1fr. Keep the selector relationships intact and inspect the preview.
Hint & worked example
A max-width media query applies at and below its boundary; the base layout should remain usable without it.
The requested selectors and declarations exist outside comments.
```
.layout { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 40rem) { .layout { grid-template-columns: 1fr; } }
```
Common mistake to avoid: Hiding all overflow always makes content accessible.
3
Verify the complete mobile media query pattern
Finish the pattern with: .layout with display: grid, grid-template-columns: repeat(2,minmax(0,1fr)); @media(max-width:40rem) — .layout with grid-template-columns: 1fr; .layout with gap: 1rem. Keep the selector relationships intact and inspect the preview.
Hint & worked example
A max-width media query applies at and below its boundary; the base layout should remain usable without it.
The requested selectors and declarations exist outside comments.
```
.layout { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 40rem) { .layout { grid-template-columns: 1fr; } }
.layout { gap: 1rem; }
```
Common mistake to avoid: If the page fits one desktop viewport, no narrower viewport needs checking.

Understand the pattern

A max-width media query applies at and below its boundary; the base layout should remain usable without it.

Misconceptions to reject

If the page fits one desktop viewport, no narrower viewport needs checking.
Hiding all overflow always makes content accessible.

The preview is a sanitized subset, not a full browser compatibility test.

Worked example and expected result

.layout { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 40rem) { .layout { grid-template-columns: 1fr; } }
.layout { gap: 1rem; }

A max-width media query applies at and below its boundary; the base layout should remain usable without it.

Try a variation

Adapt the final example to a different project name while retaining its structure and relationships. A different context still needs a real browser and accessibility check.

Explain it

Which statement correctly explains mobile media query?A max-width media query applies at and below its boundary; the base layout should remain usable without it.If the page fits one desktop viewport, no narrower viewport needs checking.Hiding all overflow always makes content accessible.

Apply it elsewhere

You reuse mobile media query in a different project. What must still be verified?Nothing; passing a single exercise guarantees every future use.Only whether the source code has the same number of lines.The resulting layout, focus behavior, and readability at the target viewport sizes.

Keep the momentum.

Complete the lab, then explain and apply the pattern.

Next: Layout and responsive: Desktop media query Try an incident drill

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