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.

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

Any suggestions?

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.

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

Any suggestions?