where can I read the default style's CSS?

[JamesUK]

I've created a new style but I'm struggling with my buttons
I've updated all the image buttons to new images, but I'd like to update the CSS controlled standard buttons like the 'submit new thread' and 'preview post' buttons in the post edit screen.

I can see the space in the Style Editor where the 'Buttons' pane lives and I'm happy that I can input a background and text colour and those update just fine, but if I put any values in there, I lose the rollover highlight function of the default button.

Is there somewhere I can view the default CSS properties for these buttons so I can include the rollover in my new style (I guess I can copy and paste the code into the 'Extra CSS Attributes' box of my new style) and also see how the gradient is included in the standard buttons too so I can have a play with that?

thanks,
James