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curriculum/challenges/english/blocks/workshop-piano/612ea4c4993aba52ab4aa32e.md

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--description--

Now it's time to use the pseudo-selectors you set up earlier. To create the black keys, add a new .key.black--key::after selector. This targets elements with both key and black--key classes and selects the pseudo-element created after these elements in the HTML.

In the new selector, set the background-color to #1d1e22. Also set the content property to "". This will make the pseudo-elements empty.

The content property is used to set or override the content of an element. By default, the pseudo-elements created by the ::before and ::after selectors are empty, which means they are not rendered on the page. By setting the content property to an empty string "", you ensure that the pseudo-elements are rendered, while still appearing empty.

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.

--hints--

You should have a .key.black--key::after selector.

js
assert.exists(new __helpers.CSSHelp(document).getStyle('.key.black--key::after'));

Your .key.black--key::after selector should have a background-color property set to #1d1e22.

js
assert.equal(new __helpers.CSSHelp(document).getStyle('.key.black--key::after')?.backgroundColor, 'rgb(29, 30, 34)');

Your .key.black--key::after selector should have a content property set to "".

js
assert.equal(new __helpers.CSSHelp(document).getStyle('.key.black--key::after')?.content, '""');

--seed--

--seed-contents--

html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Piano</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./styles.css">
  </head>
  <body>
    <div id="piano">
      <div class="keys">
        <div class="key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>
        <div class="key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>

        <div class="key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>
        <div class="key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>

        <div class="key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>
        <div class="key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>
      </div>
    </div>
  </body>
</html>
css
html {
  box-sizing: border-box;
}

*, *::before, *::after {
  box-sizing: inherit;
}

#piano {
  background-color: #00471b;
  width: 992px;
  height: 290px;
  margin: 80px auto;
  padding: 90px 20px 0 20px;
}

.keys {
  background-color: #040404;
  width: 949px;
  height: 180px;
  padding-left: 2px;
}

.key {
  background-color: #ffffff;
  position: relative;
  width: 41px;
  height: 175px;
  margin: 2px;
  float: left;
}

--fcc-editable-region--

--fcc-editable-region--