출처: http://www.w3schools.com/css/css_navbar.asp

Navigation Bars

Having easy-to-use navigation is important for any web site.

With CSS you can transform boring HTML menus into good-looking navigation bars.

Navigation Bar = List of Links

A navigation bar needs standard HTML as a base.

In our examples we will build the navigation bar from a standard HTML list.

A navigation bar is basically a list of links, so using the <ul> and <li> elements makes perfect sense:

CSS Navigation Bars

Fully styled vertical navigation bar
Fully styled horizontal navigation bar

Navigation bars explained