Please help me. i keep getting 15/16 on my product landing page

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I don’t seem to understand what needs to be done. I keep getting 15/16. Please someone should please help. (https://codepen.io/BashirAdigun/pen/oNxPWEw)

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The problem is href="#brief history " and id="brief history". If i change them to href="#brief-history" and id="brief-history" respectively, it passes.

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many thanks. i really appreciate your prompt reponse

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