As long as they are linked to the pages:
In the file browser: Select all the files that make up the main body (content, usually not the boilerplate files:titlepage,coverpage)
rightclick: Link stylesheet: tick BOTH CSS you list as any existing usage not ticked will be deleted.
There is no need of the infile CSS if you cover those cases in the main CSS
h2, h3 {text-align: center; }
centers all H2 and H3.. Anyplace in the book
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