---
id: 6153a3952facd25a83fe8083
title: Step 20
challengeType: 0
dashedName: step-20
---
# --description--
Create a media query for screens smaller than `800px` in width. In that media query, create a `#gallery img` rule and set the `width` property to `50%`. This will convert your gallery to a two-column layout.
# --hints--
You should add a new `@media` query.
```js
assert(new __helpers.CSSHelp(document).getCSSRules('media')?.length === 1);
```
Your new `@media` query should have a `max-width` of `800px`.
```js
assert(new __helpers.CSSHelp(document).getCSSRules('media')?.[0]?.media?.mediaText === '(max-width: 800px)');
```
Your `@media` query should have a `#gallery img` rule.
```js
const rules = new __helpers.CSSHelp(document).getRuleListsWithinMedia('(max-width: 800px)');
assert(rules?.find(rule => rule.selectorText === '#gallery img'));
```
Your `#gallery img` rule should have a `width` property set to `50%`.
```js
const rules = new __helpers.CSSHelp(document).getRuleListsWithinMedia('(max-width: 800px)');
const imgRule = rules?.find(rule => rule.selectorText === '#gallery img');
assert(imgRule?.style.width === '50%');
```
# --seed--
## --seed-contents--
```html
Photo Gallery
