No, adding a background color would not get overridden by the book CSS, since the color would have to be added via CSS and whether it gets overridden or not depends on CSS specificity rules.
Not to mention that adding a background color to the editor is also wrong because it will give the false impression that the page has a background color when it really does not. The editor's preview panel is not a browser, it is meant to facilitate editing. And adding hidden CSS rules the suer does not know about and cannot change absolutely does not facilitate editing.
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