I have been playing around lately with responsive web design. My department is in the process of redesigning our site. To help everybody visualize what the site will look like and to help me with figuring out the css, I have been building a prototype out of just HTML5 and CSS3. The CSS generated by SASS. Scripting to run menus and other features will be added later.  You must have a recent browser for it to work right, and since it is a prototype, I am not in any hurry to make it compatible with older browsers.

Take a look. (server taken off line.)