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---
id: 615380dff67172357fcf0425
title: Step 7
challengeType: 0
dashedName: step-7
---
# --description--
Normalize your box model by creating a `*` selector and setting the `box-sizing` property to `border-box`.
# --hints--
You should have a `*` selector.
```js
assert.exists(new __helpers.CSSHelp(document).getStyle('*'));
```
Your `*` selector should have a `box-sizing` property set to `border-box`.
```js
assert(new __helpers.CSSHelp(document).getStyle('*')?.boxSizing === 'border-box');
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Photo Gallery</title>
<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
--fcc-editable-region--
--fcc-editable-region--
```