The VA uses Bootstrap to implement the current responsive design templates for VA web pages. These are automatically included for all websites that are Electronic Content Management System forms based.
You can access the CSS file to determine the styles available to you and include them in custom sites (if needed) as shown below.
<link href="https://www.va.gov/va_files/2014/responsive/styles/bootstrap.css" media="all" rel="stylesheet" type="text/css">
The Veterans Health Administration prepared a primer on the features available via the new responsive design and how to use Bootstrap CSS on your websites.