diff --git a/src/editor/viewport/GameViewport.ts b/src/editor/viewport/GameViewport.ts
index 0e134a77..a1ba27b1 100644
--- a/src/editor/viewport/GameViewport.ts
+++ b/src/editor/viewport/GameViewport.ts
@@ -6,7 +6,7 @@ import { type FederatedPointerEvent, Text } from 'pixi.js';
 import { isSymbolType } from '../../core/model/AssetTypes';
 import type { EditorState } from '../state';
 import type { World } from '../../runtime/World';
-import { textStyle, ui } from '../../ui';
+import { Theme, textStyle, ui } from '../../ui';
 import { type ActiveCamera, cameraOfItems, cameraOfWorld } from '../../viewport/activeCamera';
 import { collectHolderItems, collectWorldItems } from '../../viewport/items';
 import {
@@ -19,8 +19,6 @@ import {
 } from '../../viewport/view';
 import { type Frame, WorldViewport } from './WorldViewport';
 
-const LETTERBOX_COLOR = 0x000000;
-
 export class GameViewport extends WorldViewport {
   private readonly hint = new Text({ text: 'No active camera', style: textStyle('muted') });
   private readonly editorRunCaption = new Text({
@@ -102,7 +100,9 @@ export class GameViewport extends WorldViewport {
   }
 
   private modelFrame(): Frame {
-    return collectHolderItems(this.state.project, this.state.activeScene, LETTERBOX_COLOR, this.editorWorld);
+    const state = this.state;
+    const background = Theme.colors.background;
+    return collectHolderItems(state.project, state.activeScene, background, this.editorWorld);
   }
 
   /**
@@ -134,7 +134,7 @@ export class GameViewport extends WorldViewport {
   }
 
   protected override get baseColor(): number {
-    return LETTERBOX_COLOR;
+    return Theme.colors.background;
   }
 
   protected override beforeItems(view: View | null): void {
diff --git a/tools/e2e/03-play.mjs b/tools/e2e/03-play.mjs
index f459dc33..c93ea81b 100644
--- a/tools/e2e/03-play.mjs
+++ b/tools/e2e/03-play.mjs
@@ -254,7 +254,8 @@ export async function play(t) {
   );
   check(
     'and the crate is really drawn there, not left as letterbox',
-    previewPixel !== '#000000',
+    // The letterbox is Theme.colors.background.
+    previewPixel !== '#1b1d22',
     previewPixel,
   );
   await shot('10c-game-preview');