Setup Panel with label nr 4

src/main/java/src/MainFrame.java

@@ -46,13 +46,15 @@ public class MainFrame extends JFrame {
         JPanel jPanel1 = setupNums("1");
         boxPanel.add(jPanel1);
 
-
         JPanel jPanel2 = setupNums("2");
         boxPanel.add(jPanel2);
 
         JPanel jPanel3 = setupNums("3");
         boxPanel.add(jPanel3);
 
+        JPanel jPanel4 = setupNums("4");
+        boxPanel.add(jPanel4);
+
 
         JButton back = new JButton();
         back.setVisible(true);