First, I think some definitions are needed to get on common ground.
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Can you make a CSS that says, "this" will be put in the head of every page and "this" will be in the body?
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Since HTML has <head> tags it can be a little confusing. I think you are referring to the top part of a page where most people would describe as the "banner". And the body you refer to meaning the "rest of the page". Is that what you are talking about?
You can do that with CSS. I don't know if it is the best way to do it without knowing more about what you are trying to do. You could create different classes or id in the CSS and use them for <div>'s that are at the top of the page to create different banners for different pages. If they are just different images for backgrounds on the banner you may find that editting each page is just as easy as having 20 different id's in your CSS. Give us a little more detail on you end goal and we may be able to be more specific.