Olivier Constant

I guess the issue comme from gulpfile.js, can you try to replace at the end of the function of gulp.task('scripts', function() {}), the part of code: } else { bundle();...

You have to import it in your main.scss, using relative path. You can see an example in the feature/bootstrap branch: https://github.com/TFaga/generator-react-reflux/blob/feature/bootstrap/app/templates/app/styles/main.scss