diff --git a/src/js/app.js b/src/js/app.js
index a41785f..724d341 100644
--- a/src/js/app.js
+++ b/src/js/app.js
@@ -3,8 +3,8 @@ import { Settings } from './settings.js';
 import { Pointer } from './pointer.js';
 
 export class App {
-  constructor(w, h) {
-    this.canvas = document.querySelector('canvas');
+  constructor(canvas, w, h) {
+    this.canvas = canvas;
     this.context = this.canvas.getContext('2d');
 
     this.scene = new Scene(this.canvas, this.context, w, h);
diff --git a/src/js/game.js b/src/js/game.js
index 0f73560..fa4394f 100644
--- a/src/js/game.js
+++ b/src/js/game.js
@@ -1,5 +1,5 @@
 import { App } from './app.js';
 
 window.addEventListener('DOMContentLoaded', () => {
-  new App(400, 400);
+  new App(document.querySelector('canvas'), 400, 400);
 });