2021-09-13 09:51:42 -07:00
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---
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id: 612e89562043183c86df287c
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2021-10-21 10:07:52 -07:00
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title: Step 9
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2021-09-13 09:51:42 -07:00
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challengeType: 0
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2021-10-21 10:07:52 -07:00
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dashedName: step-9
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2021-09-13 09:51:42 -07:00
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---
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# --description--
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Browsers can apply default margin and padding values to specific elements. To make sure your piano looks correct, you need to reset the box model.
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Add an `html` rule selector to your CSS file, and set the `box-sizing` property to `border-box`.
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# --hints--
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You should have an `html` selector.
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```js
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assert(new __helpers.CSSHelp(document).getStyle('html'));
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```
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Your `html` selector should have the `box-sizing` property set to `border-box`.
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```js
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assert(new __helpers.CSSHelp(document).getStyle('html')?.boxSizing === 'border-box');
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```
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# --seed--
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## --seed-contents--
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```html
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8" />
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2022-03-14 15:54:43 +00:00
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<title>Piano</title>
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2021-09-13 09:51:42 -07:00
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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2021-12-22 16:16:59 +00:00
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<link rel="stylesheet" href="./styles.css" />
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2021-09-13 09:51:42 -07:00
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</head>
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<body>
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<div id="piano">
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<div class="keys">
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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</div>
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</div>
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</body>
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</html>
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```
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```css
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--fcc-editable-region--
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--fcc-editable-region--
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```
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