Change the menu

Hello team. I love the catchbox theme very much, I have used it already a few times. But now on this site http://baschnagelhof.alfahosting.org/ 1.I would like to get rid of the black vertical lines between the menu-tabs. Is this possible. 2.And then I would like to put in a different color for the menu text not only by hoover but also by active. I cannot find where to change this in css. 3. Then is it possible to put the logo in the center??? Thanx and greetings Marga