JavaFX LineChar design

Controller.java

package sample;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.XYChart;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    private double x = 0,y = 0;

    @FXML
    private LineChart<?, ?> lineChart;

    @FXML
    private AnchorPane sideBar;

    private Stage stage;


    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        sideBar.setOnMousePressed(mouseEvent -> {
            x = mouseEvent.getSceneX();
            y = mouseEvent.getSceneY();
        });

        sideBar.setOnMouseDragged(mouseEvent -> {
            stage.setX(mouseEvent.getScreenX() - x);
            stage.setY(mouseEvent.getScreenY() - y);
        });

        lineChart.getXAxis().setLabel("XAxis");
        lineChart.getYAxis().setLabel("YAxis");

        XYChart.Series series1 = new XYChart.Series();

        series1.getData().add(new XYChart.Data("1",5));
        series1.getData().add(new XYChart.Data("2",4));
        series1.getData().add(new XYChart.Data("3",6));
        series1.getData().add(new XYChart.Data("5",3));
        series1.getData().add(new XYChart.Data("9",10));

        XYChart.Series series2 = new XYChart.Series();

        series2.getData().add(new XYChart.Data("1",2));
        series2.getData().add(new XYChart.Data("3",2));
        series2.getData().add(new XYChart.Data("4",5));

        XYChart.Series series3 = new XYChart.Series();

        series3.getData().add(new XYChart.Data("1",1));
        series3.getData().add(new XYChart.Data("2",4));
        series3.getData().add(new XYChart.Data("4",9));

        lineChart.getData().addAll(series1,series2,series3);
    }

    public void setStage(Stage stage){
        this.stage = stage;
    }

    @FXML
    void closeProgram(ActionEvent event) {
        stage.close();
    }
}

Main.java

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        FXMLLoader loader = new FXMLLoader(getClass().getResource("sample.fxml"));
        Parent root = loader.load();
        Controller controller = loader.getController();
        Scene scene = new Scene(root);

        scene.setFill(Color.TRANSPARENT);
        primaryStage.initStyle(StageStyle.TRANSPARENT);

        primaryStage.setScene(scene);

        controller.setStage(primaryStage);
        primaryStage.show();
    }


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

sample.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.chart.CategoryAxis?>
<?import javafx.scene.chart.LineChart?>
<?import javafx.scene.chart.NumberAxis?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.VBox?>

<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" style="-fx-background-color: transparent;" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" styleClass="background" stylesheets="@style.css">
         <children>
            <AnchorPane fx:id="sideBar" prefHeight="35.0" prefWidth="600.0" styleClass="topBar" stylesheets="@style.css">
               <children>
                  <Button layoutX="548.0" layoutY="5.0" mnemonicParsing="false" onAction="#closeProgram" prefHeight="25.0" prefWidth="0.0" styleClass="closeButton" stylesheets="@style.css" text="X" textFill="WHITE" />
               </children></AnchorPane>
            <LineChart fx:id="lineChart" createSymbols="false" layoutX="14.0" layoutY="66.0" prefHeight="334.0" prefWidth="525.0" stylesheets="@style.css">
              <xAxis>
                <CategoryAxis side="BOTTOM" />
              </xAxis>
              <yAxis>
                <NumberAxis side="LEFT" />
              </yAxis>
            </LineChart>
         </children>
      </AnchorPane>
   </children>
</VBox>

style.css

.invisibleBox{
    -fx-background-color: transparent;
}

.topBar{
    -fx-background-radius: 25 25 0 0;
    -fx-background-color: #0b3048;
}

.background{
    -fx-background-color: #05263b;
    -fx-background-radius: 25;
}


.closeButton{
    -fx-background-color:#0b3048;
}

.closeButton:hover{
    -fx-background-color: #e94e50;
}


.chart{
    -fx-background-color: #05263b;
    -fx-font-size: 20;
    -fx-text-fill: white;
    -fx-legend-visible: false;
}

.axis-label {
    -fx-text-fill: #ffffff;
}

.chart-plot-background {
    -fx-background-color:transparent;
}

.default-color0.chart-series-line { -fx-stroke: #238591; }
.default-color1.chart-series-line { -fx-stroke: #e5d849; }
.default-color2.chart-series-line { -fx-stroke: #ed4d51; }