如何为扩展JavaFX对象的类设置CSS样式？publicclassDiagramPaneextendsScrollPaneimplementsIDiagramEditor{//....Methodsgohere}我在main方法中尝试了以下几种方式:publicclassDiagramPaneextendsScrollPaneimplementsIDiagramEditor{DiagramPane(){this.setStyle("-fx-background-color:#f8ecc2;-fx-font-size:8pt;");setStyle("-fx-background-co
