Hi,
1. You may inspect needed class of the top header and apply different CSS style to change its background and height e.g.
.header-top-menus{
background:#808080;
}
.header-top-menus ul, .header-top-menus li{
padding:0 !important;
}
2. You may refer to point #3 from reply at other topic to learn how to apply button class for menu item.
It is possible to order style customization with Extended Support offer.
best regards,
J. Davis