I've updated bootstrap to version 3. Everything works fine except the forms which are generated by simple_form gem. I don't know how could I integrate these two together. I can't find any helpful suggestion in the github project repository either. So does anyone have a solution for me ?
There's a blog post here http://stabco.tumblr.com/post/59760641051/simple-form-bootstrap3-integration that looks like a good solution. It updates the initializer to suit bootstrap 3.