My goodness, does this really work?: "vertical-align: middle;"
People have been asking how to do that for ages on the KDP forum, and I've always thought it couldn't be done.
On the subject of Calibre doing a better job than Kindle Previewer of creating a Kindle book file, isn't that rather like saying that the Rolex being sold at the entrance to the Lincoln Tunnel is better than the one from Switzerland? I don't use KP, as it happens; I upload to the KDP and let it convert there. But of twenty-six books, I've never had a validated epub fail to convert as expected. (Well, once or twice I did get a double cover.) I use Flight Crew in Sigil, and when the cake is baked, I run it through epubcheck online.
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