"CSS Flexbox: Add Flex Superpowers to the Tweet Embed" Error

what i do wrong here?

Welcome lastgo,

If you have a question about a specific challenge as it relates to your written code for that challenge, just click the Ask for Help button located on the challenge. It will create a new topic with all code you have written and include a link to the challenge also. You will still be able to ask any questions in the post before submitting it to the forum.

Also, here are some tips:

  1. The recommended browser for the fCC curriculum is the latest stable version of Chrome
  2. Browser extensions affect the tests. Disable them
  3. Ensure you browser zoom level is set to 100%.

Thank you.

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