Different Color for Logo Area and Menu

Hey neli666,
I assume that you mean the whole bar, if that’s correct you’ll want the dark items to be white so you can see them.
Please try this code in the General Styling > Quick CSS field or in the WordPress > Customize > Additional CSS field:

#header_main_alternate.container_wrap {
    background-color: #3a7cbf !important; 
}

#top #header .av-main-nav > li.av-menu-button-bordered > a .avia-menu-text {
    color: #fff !important;
}
.header_color .avia-menu-fx {
background-color: #fff !important;
}
#menu-item-search a {
color: #fff !important;
}

Best regards,
Mike