How can I change the look of my page tabs?

I’ve looked in header.php, and the only reference to the pages I see is <?php wp_list_pages(‘title_li=&depth=1’); ?>.

So, I’m assuming I have to edit the look of the tabs in the theme editor in my dashboard. I think I’ve found where the code is, but I’m not sure which code to edit. There’s a whole bunch of code similar to this in the “page navigation” section.

#page li.current a {
background-position: left bottom;
color: #333333;
}

#page li:hover, #page li.sfhover {
background-position: right -31px;
}

I have no idea which part of it to edit though. Basically I just want to change the tab background and the font colour.

Thanks in advance :).