我的主类

public class HelloApplication extends Application {
@Override
public void start(Stage stage) throws IOException {
    FXMLLoader fxmlLoader = new FXMLLoader(HelloApplication.class.getResource("hello-view.fxml"));
    Scene scene = new Scene(fxmlLoader.load(), 320, 240);
    stage.setTitle("Hello!");
    stage.setScene(scene);
    stage.show();
}

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

我的FXML

<AnchorPane id="pane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" styleClass="root" stylesheets="@style.css" xmlns="http://javafx.com/javafx/18" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.example.finalproject.HelloController">
   <children>
      <Button layoutX="265.0" layoutY="188.0" mnemonicParsing="false" text="Button" />
   </children>
</AnchorPane>

我的CSS代码是

.root{
-fx-background-image: url('/media/b.gif');

}
我已经在eclipse中做到了，但我一直在与intellij作斗争，请帮助我