Notice that you no longer specify a filename after the folder name. Instead, you just specify a file
extension — css in this case. This instructs the ASP.NET run time to take all files with a .css
extension from the Styles folder, bundle them into a single response, and minify them by removing
unnecessary content like whitespace and comments. This final result is then streamed to the
browser, where it’s interpreted in exactly the same way as it was with the two separate files.