diff --git a/src/main/java/Main.java b/src/main/java/Main.java
index 95fb4b6..2e5e267 100644
--- a/src/main/java/Main.java
+++ b/src/main/java/Main.java
@@ -7,6 +7,9 @@
 	public static void main(String[] args) {
 		// generate window
 		JFrame mainFrame = new MainFrame();
+		mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		mainFrame.setSize(640, 480);
+		mainFrame.setLocationRelativeTo(null);
 		mainFrame.setVisible(true);
 	}