[Typo3] Scalable Inman Flash Replacement again

[Nige]

Hi,

I am trying to use the gb_sifr extension.

The extension is installed and running...text placed within the 
<flash></flash> tags is reformatted in the new font...but...

...when I try add an li.flash {} selector to my site css file (for 
example to format the size of the text to 20px), I loose all of the css 
selectors after the li.flash entry. If I place the li.flash selector at 
the end of the css file, it has no effect

Why is this selector taking over the entire site?

Nige