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---
id: 6153908a366afb4d57185c8d
title: Step 12
challengeType: 0
dashedName: step-12
---
# --description--
Flexbox can be thought of as having two axes, the main axis and the cross axis. The main axis is determined by the `flex-direction` property. If `flex-direction` is set to `row` or `row-reverse` , the main axis is horizontal. If `flex-direction` is set to `column` or `column-reverse` , the main axis is vertical.
Give your `#gallery` selector a `flex-direction` property set to `row` .
# --hints--
Your `#gallery` selector should have a `flex-direction` property set to `row` .
```js
assert(new __helpers.CSSHelp(document).getStyle('#gallery ')?.flexDirection === 'row');
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
< html >
< head >
< meta charset = "utf-8" >
< meta name = "viewport" content = "width=device-width, initial-scale=1.0" >
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< title > Photo Gallery< / title >
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< link rel = "stylesheet" href = "./styles.css" >
< / head >
< body >
< div class = "header" >
< h1 > CSS FLEXBOX PHOTO GALLERY< / h1 >
< / div >
< div id = "gallery" >
< img src = "https://cdn.freecodecamp.org/curriculum/css-photo-gallery/1.jpg" / >
< img src = "https://cdn.freecodecamp.org/curriculum/css-photo-gallery/2.jpg" / >
< img src = "https://cdn.freecodecamp.org/curriculum/css-photo-gallery/3.jpg" / >
< img src = "https://cdn.freecodecamp.org/curriculum/css-photo-gallery/4.jpg" / >
< img src = "https://cdn.freecodecamp.org/curriculum/css-photo-gallery/5.jpg" / >
< img src = "https://cdn.freecodecamp.org/curriculum/css-photo-gallery/6.jpg" / >
< img src = "https://cdn.freecodecamp.org/curriculum/css-photo-gallery/7.jpg" / >
< img src = "https://cdn.freecodecamp.org/curriculum/css-photo-gallery/8.jpg" / >
< img src = "https://cdn.freecodecamp.org/curriculum/css-photo-gallery/9.jpg" / >
< img src = "https://cdn.freecodecamp.org/curriculum/css-photo-gallery/10.jpg" / >
< / div >
< / body >
< / html >
```
```css
* {
box-sizing: border-box;
}
body {
margin: 0;
font-family: Arial;
background: #EBE7E7 ;
}
.header {
text-align: center;
padding: 32px;
background: #E0DDDD ;
}
--fcc-editable-region--
#gallery {
display: flex;
}
--fcc-editable-region--
#gallery img {
width: 25%;
height: 300px;
}
```
