href="..\css\style.css" 

That is a local URI to a file called "..\css\style.css"  in the current directory.
If you want a file called style.css in a sibling directory called css
then the relative URI is

"../css/style.css" 

some browsers may silently correct your error and change \ to / but some
don't and arguably those that do are not conforming.

David

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