Urgent help please: my productlandinpage project and header/layout

Dear all,
many thanks to all your help in advance.
I have spent nights and hours but I couldn’t be sorted out.
It means theory knowledge don’t ready but I need to submit tomorrow this project.
Could you give me some clue, please

https://codepen.io/dervish-mum/pen/eYYGBzY

fatsu

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