In the block about CSS, one word is highlighted using the <span> tag.
We need to add weight to this fragment with a value of 800.
Use inline styles.

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index.html

<!DOCTYPE html>
<html>
  <head>
    <title>Bold text</title>
  </head>
  <body>
    <div>CSS isn’t the prettiest <span>'language'</span>, but it has successfully powered the styling of the web for over 20 years now.</div>
  </body>
</html>