Flex and @media in Legacy Product Lnding Page

I was part way through writing the Product Landing Page when the new freeCodeCamp HTML-CSS course was introduced. I am now pasting my code into the legacy course and Flexbox and @media is not being detected. From older forum posts it looks like it had to be served by Code Pen, this is not an option on the Leegacy course now that I can see. Anyone have a solution?

Update: I deleted all the code and did a simple test with just a flexbox and @media and it worked. It had something to do with posting code from another application.
Works fine in the preview and externally, just the tests not working.

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