diff --git a/.gitignore b/.gitignore
index 911fee5..0e2818a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 zig-cache/
 sample_*.kble
+backup_*.kble
diff --git a/src/conf.zig b/src/conf.zig
index b70e1e0..32f8aea 100644
--- a/src/conf.zig
+++ b/src/conf.zig
@@ -37,6 +37,11 @@ pub const default_grid_size = .{
 
 pub const default_scaling_level = 32;
 
+pub const default_window_size = .{
+    .width = default_grid_size.width * default_scaling_level,
+    .height = default_grid_size.width * default_scaling_level,
+};
+
 pub const theme = .{
     .background = ray.BLACK,
     .mode = .{
diff --git a/src/main.zig b/src/main.zig
index 27e170c..9354ec6 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -41,7 +41,7 @@ pub fn main() void {
 
     // Create window.
     ray.SetConfigFlags(ray.FLAG_WINDOW_RESIZABLE);
-    ray.InitWindow(640, 480, "KBLE");
+    ray.InitWindow(conf.default_window_size.width, conf.default_window_size.height, "KBLE");
     defer ray.CloseWindow();
 
     // Limit FPS for performance.