Give the following code, one should expect the base color for the button to be yellow when the StackPane has styleclass = .pane.test and the mouse is over.

/* The border colors reflect what should be the colors for -fx-base with the inner color showing what the button's base color should be */
.pane {
    -fx-base: black;
    -fx-border-color: black, pink;
    -fx-border-width: 6, 2;
    -fx-border-insets: 5, 7;
}

.pane .button {
    -fx-base: pink;
}

.pane.test {
    -fx-base: grey;
    -fx-border-color: grey, red;
}

.pane.test .button {
    -fx-base: red;
}

.pane:hover {
    -fx-base: orange;
    -fx-border-color: orange, green;
}

.pane:hover .button{
    -fx-base: green;
}

.pane.test:hover {
    -fx-base: blue;
    -fx-border-color: blue, yellow;
}
.pane.test:hover .button { -fx-base: yellow; }

/* this will spit out a warning which lets me know that this file was parsed. */
foo {}


import javafx.scene.control.Button;
import javafx.application.Application;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;


public class Main extends Application {

    public static void main(String[] args) {
        Application.launch(args);
    }

    String cssUrl = Main.class.getResource("test.css").toExternalForm();

    boolean add = false;
    private Parent getContent() {

        final StackPane pane = new StackPane();
        pane.getStyleClass().add("pane");
        pane.setMinSize(100, 100);
        pane.setPrefSize(100, 100);

        Button button = new Button("button") {
            @Override public void fire() {
                if (add = !add) {
                    pane.getStyleClass().add("test");
                } else {
                    pane.getStyleClass().remove("test");
                }
            }
        };
        pane.getChildren().add(button);
        
        return pane;
    }

    public void start(Stage stage) {
        stage.setX(100);
        stage.setY(100);
        stage.setWidth(300);
        stage.setHeight(300);
        final Scene scene = new Scene(getContent());
        scene.getStylesheets().add(cssUrl);
        stage.setScene(scene);
        stage.setVisible(true);

    }
}