Java SE (Java Platform, Standard Edition)

Hello,
I am trying to set the border width to 1px but in some cases it is wider. For example in the following case:

public void start(Stage primaryStage) {
    Group g = new Group();
    BorderPane content = new BorderPane();
    Label l = new Label("00:00");
    content.setCenter(l);
    g.getChildren().add(content);
    content.setStyle("-fx-border-width: 1px;-fx-border-color: red;");
    
    StackPane root = new StackPane();
    root.getChildren().add(g);
    Scene scene = new Scene(root);
    primaryStage.setScene(scene);
    primaryStage.show();
  }

Is there some way how to avoid this behaviour?