CSS Help

Hi, I've just installed uddeIM on my site and must say I am very impressed. I have edited the default template to fit my site. I have one problem and can't seem to find the answer. My site is dark and uses a transparent template, I need to edit the send buttton to a brighter color but can't seem to find it anywhere in the css. Does the send button use java script or am I just blind? Thanks for any help in advance.

Regards
Dave

The send button is:

[code:1][...]
<input name="reply" class="button" value="Absenden" type="submit"><span class="uddeim-sendoption"><input name="copytome" type="checkbox">Kopie an mich</span></form>
[/code:1]

So the class should be "button"