So, the h1 is styled by class="block_12"
block_12 is styled as...
.block_12 {
display: block;
font-size: 0.83333em;
font-weight: bold;
page-break-after: avoid;
page-break-inside: avoid;
text-align: center;
text-indent: 0;
margin: 0 0 18pt;
padding: 0;
}
So you need to change 0.83333em to something bigger than the body text.
Personally, I would remove all the "font-size" throughout the stylesheet except for where it is used to be different from the body text, like in headings or footnotes. And then round those to whole or single decimal numbers eg 1em, 1.5em etc.
What type of book is it? I don't know how complex your ebook is, but 32 classes could be considered a bit much for a standard type novel.
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