The way it's supposed to work is that titlepage.xhtml has the values for the dimensions for the cover image. Then if you care about how it looks, you have the aspect ratio correct. So the cover image will fill the screen top to bottom, but usually not left to right as that would make the cover image stretched and look off. So the best thing is to check that you want the aspect ratio preserved and you want to use the correct profile as a tablet profile can mess things up when the image is larger then your screen.
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