twitter/bootstrap — pull request #8191 by FLOKER (2013-06-17 15:00:41+00:00)
Title: beautify select border-radiuses in input-groups

though not visible in most OSX browsers, you can see a difference in
Firefox or other browsers on Windows

https://www.dropbox.com/s/rf4br9z0qvlo3sg/Bildschirmfoto%202013-06-17%20um%2016.59.33.png