We need these resources for offline usage.

FontAwesome: (just download the css and fonts)
https://github.com/FortAwesome/Font-Awesome

Google Materialize Icon:
https://github.com/google/material-design-icons/

Other fonts from Google:
https://fonts.googleapis.com/css?family=Roboto:300,400,500,700 
We download all the font file from google font.
Save a local copy of the above css file with fonts.