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Step 10

curriculum/challenges/english/blocks/learn-responsive-web-design-by-building-a-piano/612e89d254fe5d3df7d6693d.md

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--description--

Now that you have reset the html box model, you need to pass that on to the elements within as well. To do this, you can set the box-sizing property to inherit, which will tell the targeted elements to use the same value as the parent element.

You will also need to target the pseudo-elements, which are special keywords that follow a selector. The two pseudo-elements you will be using are the ::before and ::after pseudo-elements.

The ::before selector creates a pseudo-element which is the first child of the selected element, while the ::after selector creates a pseudo-element which is the last child of the selected element. These pseudo-elements are often used to create cosmetic content, which you will see later in this project.

For now, create a CSS selector to target all elements with *, and include the pseudo-elements with ::before and ::after. Set the box-sizing property to inherit.

--hints--

You should have a *, ::before, ::after selector.

js
assert(new __helpers.CSSHelp(document).getStyle('*, ::before, ::after'));

Your *, ::before, ::after selector should have the box-sizing property set to inherit.

js
assert(new __helpers.CSSHelp(document).getStyle('*, ::before, ::after')?.boxSizing === 'inherit');

--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
--fcc-editable-region--
html {
  box-sizing: border-box;
}
--fcc-editable-region--