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CSS=Cascading Style Sheet. It is the stylesheet which is part of your book. In the listing for p there may be several items enclosed in the {} brackets which control what the paragraph margin is at the top and what it is at the bottom.
See the listing above. If you open the book in sigil and look at the book browser, the style folder and style sheet will be all by itself. Click on it and study it, together with the above info along with the web site I pointed out to you.
If there is no stylesheet, then the style information is located at the top of each file that makes up the book. You can check there too. Theoretically you could do both, but to avoid confusion, people either put the style information at the top of each text file, or they use a stylesheet to which all the text files refer. If it is at the top of each file, it will be enclosed with <style> tags, if I recall correctly.
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