Can't identify the elements
That was the first thing I tried to do. The tab element is either class="link" or class="current link" and the bar of the nab is "ps_main" but changing "ps_main" does not seem to do anything, "current link" I think is dynamically generated and not in the style sheets, "a.link" is the only one I can find and does not offer much control.
I want to reduce the height of the bar to 30px and the a.link container. I have got rid of the round corners.