http://benalman.com/code/projects/css-misc/examples/
Expanding box with shim: explanation, example
These CSS examples are typically tested in these browsers:
Internet Explorer 6-8, Firefox 2-3.6, Safari 3-4, Chrome, Opera 9.6-10.
Copyright (c) 2009 "Cowboy" Ben Alman
Licensed under the MIT license
http://benalman.com/about/license/