In JSF 2 a CSS stylesheet can be configured as a resource:
<link rel="stylesheet" type="text/css" href="#

"/>

This means that the css file "hska.css" can be found in a subdirectory "css" of the directory "resources" (plural although the variable is just named "resource" !). The directory "resources" can be found either
a) just below "WebContents" of the web project or
b) in src/META-INF of the web project