CSS Library: Horizontal CSS Menus: CSS3 demos: Here
Flat flipping menu buttons
Author: Dynamic Drive
These menu buttons combine the two hot trends that are flat design (absence of bevels, gradients and shadows etc) and CSS3 to create a bold and modern looking navigation system. Each icon inside the button can either be an image, or CSS icon font (as in first example below) for leaner and more rapid deployment. An optional text can be added beneath each button for additional cue.
Note: The CSS icon fonts in the 1st exaample are from Font Awesome. The social icons in the 2nd example used can be found here.
The CSS:





