The custom.css and all other css files under Themes folder "\Website\sitecore modules\Shell\Web Forms for Marketers\Themes" gets loaded in web browser on vanilla version of Sitecore 8.1 update 3 but it does not work on my project instance. I believe the developer who worked on it before me has made some changes to pipelines which call these css files to load.

[![Theme files][1]][1]

[![Sitecore][2]][2]

I cannot seem to find anything related to this on internet.

Any suggestions?


  [1]: https://i.sstatic.net/1g5Ed.png
  [2]: https://i.sstatic.net/Zn6TK.png