Try changing all occurrences (@font-face and body) of font-family to
Code:
font-family: serif;
i.e. lowercase s and no quotes.
Also, there is a bug in the Sony firmware reader app, where italics and bold are not displayed consistently when using any font other than 'Original'.
Forum member Morkl has written an updated reader app which corrects this fault and gives a few extra nice features. There is a bit of a snag though. The latest release was written to work with Sony firmware version 1.0.03.11140. There has not yet been a full release which incorporates the Sony upgrade to version 1.0.04.12210.
You can read more about Morkl's PRST1 enhancements in
this thread and
this thread.
P.S Welcome to MobileRead