Have you tried removing the whitespace inside your code elements? If not, does it work without the pre elements around the code elements?
That particular part of the challenge was inside a paywall for me but I can see which bit hasn’t passed.
When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.
You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.
See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').