I solved the problem by using this method,
by changing the code in "titlepage.xhtml" with Calibre
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Example using <svg>
Code:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Cover</title>
<style type="text/css">@page {margin:0px;}</style>
</head>
<body style="margin:0px;">
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org 1999/xlink"
width="100%" height="100%" version="1.1"
viewBox="0 0 1080 1440" preserveAspectRatio="xMidYMid meet">
<image width="1080" height="1440" xlink:href="cover.jpg"/>
</svg>
</body>
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Found here:
https://www.mobileread.com/forums/sho...d.php?t=280603
Thanks to GeoffR