Scaffolding css

I have been searching documentation and can't find anything on how I should scaffold my project, i.e where do I put my css folder, should it go in views, should it go in the applications folder, should it sit in the website route.

I'm more used to drupal and wordpress where I place these things inside theme folders, I guess I could place the css directory wherever I like but CodeIgniter must have a best practice method for this?