The sgc-1 was simply center and nothing else.
p.sgc-1 {text-align: center;}
The stylesheet for p had no top or bottom margins that might have done it.
p {
text-indent: 2em;
text-align: justify;
font-size: 1em;
margin-top:0;
margin-bottom:0;
}
I really couldn't see any reason for the blank page, but the other code didn't produce it, so I was happy with figuring that much out. Actually, I opened another book that didn't have the blank page after the cover and used that code, not that I figured it out on my own
.