I know that by default the bootstrap doesn\'t come with the file, but after I customized (I\'ve selected all the responsive features!) I still can\'t see the file. At the do
look here http://twitter.github.io/bootstrap/scaffolding.html#responsive
Bootstrap doesn't include responsive features by default at this time as not everything needs to be responsive. Instead of encouraging developers to remove this feature, we figure it best to enable it as needed.
So if you need bootstrap-responsive.css, you should download it from bootstrap-source, from here for example: http://twitter.github.io/bootstrap/index.html