’m trying to download and re-brand a website with HTTRack ( for a school
assignment) 

I’ve tried to use HTTRack and it seems to put the sites different pages into
separate index.html files.

Does this mean if you want to edit the sites design - you would have to make
all the same edits in every html file it gives you?
The web site in question has hundreds of pages so I don’t think I could copy
paste the design changes into each of them. Is there a simpler way to do it?
Is there a script available to make it easier?