[Topcliffe]

Hello, I'm an ebook newbie and total dullard when it comes to coding. I'm in the process of formatting an ebook with Calibre editor, but when I preview the book in Kindle Reader or on KDP's online previewer, there's too much white space above and below the text.

Is there an overarching setting in CSS that controls that feature?

Many thanks in advance for any help or insights.