Abacus/src/main/resources/abacus.fxml

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

<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>

<?import javafx.scene.text.Text?>
<BorderPane xmlns="http://javafx.com/javafx"
            xmlns:fx="http://javafx.com/fxml"
            fx:controller="org.nwapw.abacus.fx.AbacusController">
    <center>
        <TabPane>
            <Tab text="Calculator" closable="false">
                <BorderPane>
                    <bottom>
                        <VBox>
                            <ScrollPane prefHeight="50" vbarPolicy="NEVER">
                                <padding><Insets top="10" bottom="10" left="10" right="10"/></padding>
                                <Text fx:id="outputText"/>
                            </ScrollPane>
                            <TextField fx:id="inputField" onAction="#performCalculation"/>
                            <Button fx:id="inputButton" text="Calculate" maxWidth="Infinity" onAction="#performCalculation"/>
                        </VBox>
                    </bottom>
                </BorderPane>
            </Tab>
            <Tab text="Settings" closable="false"/>
        </TabPane>
    </center>

</BorderPane>