You have a typo in one of your .main-section
id attributes.
The text and href of one of your nav-links does not match the id and header of the corresponding section (there’s an extra/missing word).
The casing of your href and corresponding section id attributes is not consistent in a few cases (e.g. ‘hello_World’ and ‘hello_world’).
When I fixed all of these issues, your code passes all of the above tests.
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