1 pointHello Crazy go to sources/Default/css/modules_header,/modules_header_menu_slimmenu.css you will find the css.
1 pointYes you can do that, Look this line : $product_tab_description .= '<div class="tab-pane" id="tab' . $n . '">' . $r . '</div>'; you have just add the same after the loop and update. After you can make a new one with all that you want inside.