Widows and Orphans

Hi all,

Can you help please? I have search the forums and not quite found what I was looking for.

I have converted the book with Calibre to AZW3 and then sent this to the Kindle (Touch and Paperwhite). It is almost perfect, but has widows and orphans.

So I edited the book CSS (the majority of the text is block 7 (start of chapter) and block 8 (all other paragraphs)):

.block_7 {
display: block;
margin: 0;
padding: 0
widows: 2;
orphans: 2;
}
.block_8 {
display: block;
text-indent: 14.2pt;
margin: 0;
padding: 0
widows: 2;
orphans: 2;

Sadly, I still have widows and orphans.

What am I doing wrong?