25aa04e2e7
* chore(curriculum): accessibility-quiz * chore(curriculum): cafe-menu * chore(curriculum): ferris-wheel * chore(curriculum): fix ferris-wheel tests * chore(curriculum): colored-markers * chore(curriculum): photo-gallery * chore(curriculum): magazine * chore(curriculum): penguin * chore(curriculum): city-skyline * chore(curriculum): registration-form * chore(curriculum): picasso-painting * chore(curriculum): balance-sheet * chore(curriculum): piano * chore(curriculum): rothko-painting * fix: title min 15 chars
120 lines
3.3 KiB
Markdown
120 lines
3.3 KiB
Markdown
---
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id: 612ea4c4993aba52ab4aa32e
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title: Step 18
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challengeType: 0
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dashedName: step-18
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---
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# --description--
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Now it is time to use the pseudo-selectors you prepared for earlier. To create the black keys, add a new `.key.black--key::after` selector. This will target the elements with the class `key black--key`, and select the pseudo-element after these elements in the HTML.
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In the new selector, set the `background-color` to `#1d1e22`. Also set the `content` property to `""`. This will make the pseudo-elements empty.
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The `content` property is used to set or override the content of the element. By default, the psuedo-elements created by the `::before` and `::after` pseudo-selectors are empty, and the elements will not be rendered to the page. Setting the `content` property to an empty string `""` will ensure the element is rendered to the page while still being empty.
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If you would like to experiment, try removing the `background-color` property and setting different values for the `content` property, such as `"♥"`. Remember to undo these changes when you are done so the tests pass.
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# --hints--
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You should have a `.key.black--key::after` selector.
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```js
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assert(new __helpers.CSSHelp(document).getStyle('.key.black--key::after'));
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```
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Your `.key.black--key::after` selector should have a `background-color` property set to `#1d1e22`.
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```js
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assert(new __helpers.CSSHelp(document).getStyle('.key.black--key::after')?.backgroundColor === 'rgb(29, 30, 34)');
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```
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Your `.key.black--key::after` selector should have a `content` property set to `""`.
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```js
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assert(new __helpers.CSSHelp(document).getStyle('.key.black--key::after')?.content === '""');
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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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<title>Piano</title>
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<link rel="stylesheet" href="./styles.css">
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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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html {
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box-sizing: border-box;
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}
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*, *::before, *::after {
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box-sizing: inherit;
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}
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#piano {
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background-color: #00471b;
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width: 992px;
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height: 290px;
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margin: 80px auto;
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padding: 90px 20px 0 20px;
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}
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.keys {
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background-color: #040404;
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width: 949px;
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height: 180px;
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padding-left: 2px;
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}
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.key {
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background-color: #ffffff;
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position: relative;
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width: 41px;
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height: 175px;
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margin: 2px;
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float: left;
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}
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--fcc-editable-region--
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--fcc-editable-region--
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```
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