diff --git a/src/game.rs b/src/game.rs
index 96e97f0..60498fb 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -1,5 +1,8 @@
 use eframe::egui::Color32;
 
+pub const BOARD_W: usize = 60;
+pub const BOARD_H: usize = 25;
+
 pub struct Glyph {
     pub ch: char,
     pub fg: Color32,
@@ -64,8 +67,8 @@ pub struct GameState {
 
 impl GameState {
     pub fn new() -> Self {
-        let w = 60;
-        let h = 25;
+        let w = BOARD_W;
+        let h = BOARD_H;
 
         let mut board = Board {
             width: w,
diff --git a/src/main.rs b/src/main.rs
index ff38176..d87e073 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,13 +2,23 @@ use eframe::egui;
 use egui::{Align2, FontId, Key, Pos2, Rect, vec2};
 
 mod game;
-use game::{GameState, Glyph};
+use game::{GameState, Glyph, BOARD_W, BOARD_H};
 
 const CELL_W: f32 = 14.0;
 const CELL_H: f32 = 20.0;
 
+const MENU_H: f32 = 24.0;
+const PANEL_MARGIN: f32 = 8.0;
+
 fn main() -> eframe::Result<()> {
-    let options = eframe::NativeOptions::default();
+    let board_px_w = BOARD_W as f32 * CELL_W + 2.0 * PANEL_MARGIN;
+    let board_px_h = BOARD_H as f32 * CELL_H + MENU_H + 2.0 * PANEL_MARGIN;
+    let options = eframe::NativeOptions {
+        viewport: egui::ViewportBuilder::default()
+            .with_inner_size([board_px_w, board_px_h])
+            .with_min_inner_size([board_px_w, board_px_h]),
+        ..Default::default()
+    };
     eframe::run_native(
         "Viberogue",
         options,
@@ -47,7 +57,10 @@ impl eframe::App for App {
 
         egui::CentralPanel::default().show(ctx, |ui| {
             let board = &self.state.board;
-            let origin = ui.available_rect_before_wrap().min;
+            let available = ui.available_rect_before_wrap();
+            let board_px = vec2(board.width as f32 * CELL_W, board.height as f32 * CELL_H);
+            let offset = ((available.size() - board_px) / 2.0).max(egui::Vec2::ZERO);
+            let origin = available.min + offset;
             let painter = ui.painter();
 
             for y in 0..board.height {