HI, can anyone explain me this code?

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https://codepen.io/mgMATY/pen/JjXRMWp

hi, im doing the product landing page, and i have a error, that it is when i click one of the option (characteristiscs, how-we-work or our-prices) they carry me to the right place, but if i click it again they dont do anything, and i cannot find the problem in the href or the link.
sorry im just begin

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Hi, try adding this to your #header selector " z-index: 200; "

As you scroll down the page your links are being covered by other page content.
The z-index will move your header up above the other content so the links can be clicked.

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