Hi Zoltan,
Thanks for writing in!
1. To make it white, you can add this under Custom > CSS in the Customizer.
.x-navbar .desktop .x-nav > li > a:hover, .x-navbar .desktop .x-nav > .x-active > a, .x-navbar .desktop .x-nav > .current-menu-item > a {
box-shadow: inset 0 4px 0 0 #fff;
}
2. To change font and padding, you can add this in the style field of your custom headline element.
font-family: 'Raleway', sans-serif; padding-top:0;padding-bottom:0;
http://screencast.com/t/4mgTzcl7
Hope that helps