CSS loaded by import not working

[fbaprojetos]

I import css by import 'react-redux-toastr/lib/css/react-redux-toastr.min.css' but this is not working and simply the toastr is without styles. Inserting <link href="https://diegoddox.github.io/react-redux-toastr/7.1/react-redux-toastr.min.css" rel="stylesheet" type="text/css"> in index.html file work fine.
I'm using the project created by the create-react-app tool and I believe the webpack has css-loader but I can not guarantee it.

[diegoddox]

I'm not sure either but try to investigate/ask with them first.