I'm using the following css which works for epub but when I look at the dual mobi (converted with kindlegen) in the Mobipocket Reader the tables are at the left.
I tried changing the html from just table to table align="center" but that didn't help and as I expected it then failed with epubcheck.
PHP Code:
table {
margin-left: auto;
margin-right: auto;
border-collapse: collapse;
margin-top: 1em;
}