Responsive Web Design Projects - Build a Technical Documentation Page Challenge

Here’s my code pen link:
although I have done like instruction, I could’t pass the item 4th.
I need your help.

You were missing an underscore in “What_you_should_already_know”
That solves it. Always double check for typos!

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Hmm, i write the right form in my code, but i always get the error in this problem.
I don’t understand…

oh, i have just passed it, thank you so much