Okay, I fixed the margin issue by using this code from the Sigil FAQ. It worked, and I don't see any problems with the rest of the book.
body, div, p, h1, h2, h3, h4 { margin: 0; padding: 0; }
it moved my picture up to the top and I don't need any special spacing in this book, so it worked.
Different problem. One picture is too tall. I have all the pics sized to 566 wide, but this one picture was too long. Besides resizing until I find what fits, is there a way to code it to auto fit the picture to the page?
Here is the current code for the picture
<body>
<div class="body" style="white-space:normal">
<h1 style="text-align: center;" title="The Good Shepherd"><img alt="Misericordia Readers Primer_Page_034" src="../Images/Misericordia%20Readers%20Primer_Page_034.jpeg" /><br /></h1>
</div>
The other problem is that once I shrunk this picture and reloaded it, it fit on one page, but now left a blank page after it. I don't see any reason for that. I even merged the two files back together and resplit them to make sure there was no empty space.