@JsonProperty("css")
    public Collection<String> getCSSPaths() {
        return cssPaths;
    }
Returns the paths to all CSS resources within the extension. These paths
are defined within the manifest by the "js" property as an array of
strings, where each string is a path relative to the root of the
extension .jar.

@return
    A collection of paths to all CSS resources within the extension.
guacamole/src/main/java/org/apache/guacamole/extension/ExtensionManifest.java