Heroku buttons styling issue

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  package testapp;
  
  //IMPORT
  //JAVAFX
  import javafx.fxml.FXML;
  import javafx.fxml.FXMLLoader;
  import javafx.stage.Stage;
  import javafx.scene.Node;
  import javafx.event.ActionEvent;
  import javafx.scene.layout.BorderPane;
  //Countdown
  import javafx.animation.Timeline;
  
  public class Mainframe {
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          @FXML
          public void options(ActionEvent event){
              try{ 
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                  Stage changer = TestApp.getPrimaryStage();
                  stage.close();
                  changer.hide();
                  //My idea was to initialize again and load the styles in that way again but does not change anything
                  FXMLLoader loader = new FXMLLoader(getClass().getResource("Mainframe.fxml"));
                  loader.load();
                  Mainframe ctrl = loader.getController();
                  ctrl.initialize();
                  changer.show();
                  
                  
              }catch (Exception e) {
                  System.out.println("Error bei der App Klicken von ModeButton. \n error is: "+e);
              e.printStackTrace();
              }
          }
  
      @FXML
      public BorderPane primaryparent;
  
      //get and set for elements
      @FXML
      void initialize() {
          //Check Theme
          if(TestApp.isItDarkmode){
              primaryparent.getStylesheets().clear();
              primaryparent.getStylesheets().add(getClass().getResource(TestApp.mainDarkModePath).toString());
          }else if(!TestApp.isItDarkmode){
              primaryparent.getStylesheets().clear();
              primaryparent.getStylesheets().add(getClass().getResource(TestApp.mainLightModePath).toString());
          }
      }
      
  }
  
  

  Mainframe.fxml:

  <?xml version="1.0" encoding="UTF-8"?>
  
  <?import javafx.geometry.Insets?>
  <?import javafx.scene.control.Button?>
  <?import javafx.scene.layout.AnchorPane?>
  <?import javafx.scene.layout.BorderPane?>
  <?import javafx.scene.text.Font?>
  
  <BorderPane fx:id="primaryparent" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="0.0" minWidth="0.0" prefHeight="224.0" prefWidth="515.0" xmlns="http://javafx.com/javafx/18" xmlns:fx="http://javafx.com/fxml/1" fx:controller="testapp.Mainframe">
     <center>
        <AnchorPane prefHeight="200.0" prefWidth="200.0" styleClass="rootBackground" BorderPane.alignment="CENTER">
           <children>
              <Button fx:id="setDarkModeButton" layoutX="175.0" layoutY="99.0" mnemonicParsing="false" onAction="#options" styleClass="settingsButton" text="toggle Dark/LightMode">
                 <font>
                    <Font name="Arial" size="13.0" />
                 </font>
                 <padding>
                    <Insets bottom="5.0" left="17.0" right="17.0" top="5.0" />
                 </padding>
              </Button>
           </children>
        </AnchorPane>
     </center>
  </BorderPane>
  
  
  

  Before I just overwrote the "style.css" file and used .stop() & .show(). This worked fine. But it can get complicated the more css-files you have and after it is packed into a .jar file it doesn't work anymore.

  I hope anyone can help me. Because now I have really no Idea...