When using the Vin65 navigation tag, the pages are rendered as ul/li elements in your html. The best way to style the navigation is by wrapping it in a div that can be targeted. If the navigation tag were to be wrapped in a div with the class of 'mainMenu', the styling would look as follows.
.mainMenu ul { }
.mainMenu ul li { }
Certain classes are added in the output of the navigation so that they can be styled.
The current page link: .mainMenu ul li a.v65-selected { }
The parent link of the current page: .mainMenu ul li a.v65-pageAParent { }
The current page link in the sub menu: .v65-leftSelected { }
The "Home" link: .v65-home { }