replaced cool looking box link with inline code blocks

[dletorey]

Description

• replaced the link to the html & css files with inline code blocks
• this is a copy of PR #37263 but respects the new page structures

Motivation

• Helping @bsmth with the migration of examples into content

[github-actions]

Preview URLs

• /en-US/docs/Learn_web_development/Core/Styling_basics/Cool-looking_box

Flaws (251)

URL: /en-US/docs/Learn_web_development/Core/Styling_basics/Cool-looking_box
Title: Challenge: A cool-looking box
Flaw count: 251

• macros:
  • Wrong xref macro used (consider changing which macro you use). Error processing path /en-US/docs/Learn/Getting_started_with_the_web
  • Wrong xref macro used (consider changing which macro you use). Error processing path /en-US/docs/Learn/Getting_started_with_the_web/Installing_basic_software
  • Wrong xref macro used (consider changing which macro you use). Error processing path /en-US/docs/Learn/Getting_started_with_the_web/What_will_your_website_look_like
  • Wrong xref macro used (consider changing which macro you use). Error processing path /en-US/docs/Learn/Getting_started_with_the_web/Dealing_with_files
  • Wrong xref macro used (consider changing which macro you use). Error processing path /en-US/docs/Learn/Getting_started_with_the_web/HTML_basics
  • and 246 more flaws omitted

[bsmth]

Nice, thanks!