There's only one stylesheet in my book, and it contains these settings:
/* widows: 0; */
/* orphans: 0; */
I used to have a "width:100%;" and "height:100%;" in it as well, but I removed that as per above discussion.
If I understand you correctly then I should add a "height:100%;" to the single pseudo-fixed-layout page (the one with the dedication, for exampe). This would ensure a correct vertical centering of that page's content: