public Map<String, Resource> getCSSResources() {
        return cssResources;
    }
Returns a map of all declared CSS resources associated with this
extension, where the key of each entry in the map is the path to that
resource within the extension .jar. CSS resources are declared within
the extension manifest.

@return
    All declared CSS resources associated with this extension.
guacamole/src/main/java/org/apache/guacamole/extension/Extension.java