How to Integrate Bootstrap or Tailwind CSS with CodeIgniter

Have you ever tried integrating Bootstrap or Tailwind CSS into your CodeIgniter project? What’s the best way to include these frameworks—using a CDN or downloading and linking them locally? Also, where do you usually place your CSS files in the CodeIgniter folder structure, and how do you manage responsive layouts within your views? Share your approach or any issues you faced while working with these CSS frameworks in CodeIgniter.