http://nativecss.com/assets/samples/ios/Login%20Demo.zip
Or, there's a version in the app store:
https://itunes.apple.com/gb/app/clearer/id592386667?mt=8&...
Which is styled with this CSS: https://dl.dropbox.com/s/h5cr55q2f14x1fa/styles.css?dl=1
Cheers