Mainpage.fxml

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

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Font?>

<BorderPane fx:id="rootLayout" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="677.0" prefWidth="933.0" stylesheets="@DarkTheme.css" xmlns="http://javafx.com/javafx/8.0.102" xmlns:fx="http://javafx.com/fxml/1" fx:controller="blood.management.Mainpage">
   <top>
      <AnchorPane prefHeight="125.0" prefWidth="721.0" BorderPane.alignment="CENTER">
         <children>
            <GridPane prefHeight="125.0" prefWidth="721.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
               <columnConstraints>
                  <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                  <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                  <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                  <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
               </columnConstraints>
               <rowConstraints>
                  <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                  <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
               </rowConstraints>
               <children>
                  <Label prefHeight="60.0" prefWidth="400.0" style="-fx-background-color: #000000;" text="           Blood Bank" GridPane.columnSpan="3">
                     <font>
                        <Font name="System Bold" size="24.0" />
                     </font>
                  </Label>
                  <ImageView fitHeight="150.0" fitWidth="200.0" pickOnBounds="true" preserveRatio="true" GridPane.columnIndex="2" GridPane.columnSpan="2" GridPane.rowSpan="2">
                     <image>
                        <Image url="@../../Images/blood.jpg" />
                     </image>
                  </ImageView>
               </children>
            </GridPane>
         </children>
      </AnchorPane>
   </top>
   <left>
      <VBox prefHeight="552.0" prefWidth="150.0" stylesheets="@DarkTheme.css" BorderPane.alignment="CENTER">
         <children>
            <Button fx:id="dnor" mnemonicParsing="false" onAction="#addDonor" prefHeight="65.0" prefWidth="151.0" text="Donor" />
            <Button fx:id="reciever" mnemonicParsing="false" onAction="#setReciever" prefHeight="58.0" prefWidth="151.0" text="Blood Reciever" />
            <Button fx:id="doctor" mnemonicParsing="false" onAction="#setdoctor" prefHeight="58.0" prefWidth="151.0" text="Doctor Details" />
            <Button fx:id="employee" mnemonicParsing="false" onAction="#setEmployee" prefHeight="64.0" prefWidth="151.0" text="Employee" />
            <Button mnemonicParsing="false" onAction="#setavailableScene" prefHeight="58.0" prefWidth="151.0" text="Available Blood" />
         </children>
      </VBox>
   </left>
   <center>
      <AnchorPane prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER" />
   </center>
</BorderPane>