diff --git a/Makefile b/Makefile
index 1005c41..d15c6d4 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,7 @@ package:
 
 .PHONY: runx
 runx:
-	./src/main/shell/run-electron-app-in-xorg
+	IMGFLOAT_CHANNELS_URL=http://localhost:8080/channels ./src/main/shell/run-electron-app-in-xorg
 
 .PHONY: ssl
 ssl:
diff --git a/src/main/node/app.js b/src/main/node/app.js
index adfb490..5aca1c4 100644
--- a/src/main/node/app.js
+++ b/src/main/node/app.js
@@ -1,8 +1,9 @@
 const { app, BrowserWindow } = require("electron");
 const path = require("path");
+let broadcastRect = { width: 0, height: 0 };
 
 function createWindow() {
-    const url = "https://imgfloat.kruhlmann.dev/channels";
+    const url = process.env["IMGFLOAT_CHANNELS_URL"] || "https://imgfloat.kruhlmann.dev/channels";
     const initialWindowWidthPx = 960;
     const initialWindowHeightPx = 640;
     const applicationWindow = new BrowserWindow({
@@ -27,31 +28,30 @@ function createWindow() {
 
     const lockWindowToCanvas = async () => {
         if (applicationWindow.isDestroyed()) {
-            return false;
+            return;
         }
-        try {
-            const size = await applicationWindow.webContents.executeJavaScript(`(() => {
-                const canvas = document.getElementById('broadcast-canvas');
-                if (!canvas || !canvas.width || !canvas.height) {
-                    return null;
-                }
-                return { width: Math.round(canvas.width), height: Math.round(canvas.height) };
-            })();`);
-
-            if (size?.width && size?.height) {
-                const [currentWidth, currentHeight] = applicationWindow.getSize();
-                if (currentWidth !== size.width || currentHeight !== size.height) {
-                    applicationWindow.setSize(size.width, size.height, false);
-                }
-                applicationWindow.setMinimumSize(size.width, size.height);
-                applicationWindow.setMaximumSize(size.width, size.height);
-                applicationWindow.setResizable(false);
-                return true;
+        const size = await applicationWindow.webContents.executeJavaScript(`(() => {
+            const canvas = document.getElementById('broadcast-canvas');
+            if (!canvas) {
+                return null;
+            }
+            const rect = canvas.getBoundingClientRect();
+            return {
+                width: Math.round(rect.width),
+                height: Math.round(rect.height),
+            };
+        })();`);
+
+        if (size?.width && size?.height) {
+            if (broadcastRect.width !== size.width || broadcastRect.height !== size.height) {
+                console.log(
+                    `Window size did not match canvas old: ${broadcastRect.width}x${broadcastRect.height} new: ${size.width}x${size.height}. Resizing.`,
+                );
+                applicationWindow.setContentSize(size.width, size.height, false);
+                applicationWindow.setResizable(false);
+                broadcastRect = { ...size };
             }
-        } catch (error) {
-            // Best-effort sizing; ignore errors from early navigation states.
         }
-        return false;
     };
 
     const handleNavigation = (navigationUrl) => {
@@ -65,9 +65,6 @@ function createWindow() {
                 lockWindowToCanvas();
             } else {
                 clearCanvasSizeInterval();
-                applicationWindow.setResizable(true);
-                applicationWindow.setMinimumSize(320, 240);
-                applicationWindow.setMaximumSize(10000, 10000);
                 applicationWindow.setSize(initialWindowWidthPx, initialWindowHeightPx, false);
             }
         } catch {
diff --git a/src/main/resources/static/css/styles.css b/src/main/resources/static/css/styles.css
index 57ed61e..a65c876 100644
--- a/src/main/resources/static/css/styles.css
+++ b/src/main/resources/static/css/styles.css
@@ -1103,11 +1103,6 @@ button:disabled:hover {
 }
 
 .broadcast-body canvas {
-    position: absolute;
-    top: 0;
-    left: 0;
-    width: 100%;
-    height: 100%;
     pointer-events: none;
 }
 
diff --git a/src/main/resources/static/js/broadcast.js b/src/main/resources/static/js/broadcast.js
index 0340c13..17bc30f 100644
--- a/src/main/resources/static/js/broadcast.js
+++ b/src/main/resources/static/js/broadcast.js
@@ -154,15 +154,6 @@ function fetchCanvasSettings() {
 }
 
 function resizeCanvas() {
-    const scale = Math.min(window.innerWidth / canvasSettings.width, window.innerHeight / canvasSettings.height);
-    const displayWidth = canvasSettings.width * scale;
-    const displayHeight = canvasSettings.height * scale;
-    canvas.width = canvasSettings.width;
-    canvas.height = canvasSettings.height;
-    canvas.style.width = `${displayWidth}px`;
-    canvas.style.height = `${displayHeight}px`;
-    canvas.style.left = `${(window.innerWidth - displayWidth) / 2}px`;
-    canvas.style.top = `${(window.innerHeight - displayHeight) / 2}px`;
     draw();
 }
 
@@ -279,8 +270,8 @@ function applyPatch(assetId, patch) {
     const targetLayer = Number.isFinite(patch.layer)
         ? patch.layer
         : Number.isFinite(patch.zIndex)
-          ? patch.zIndex
-          : null;
+            ? patch.zIndex
+            : null;
     if (!isAudio && Number.isFinite(targetLayer)) {
         const currentOrder = getLayerOrder().filter((id) => id !== assetId);
         const insertIndex = Math.max(0, currentOrder.length - Math.round(targetLayer));
@@ -773,7 +764,7 @@ function setVideoSource(element, asset) {
             }
             applyVideoSource(element, next.objectUrl, asset);
         })
-        .catch(() => {});
+        .catch(() => { });
 }
 
 function applyVideoSource(element, objectUrl, asset) {
diff --git a/src/main/shell/run-electron-app-in-xorg b/src/main/shell/run-electron-app-in-xorg
index 5fa24e8..8795c40 100755
--- a/src/main/shell/run-electron-app-in-xorg
+++ b/src/main/shell/run-electron-app-in-xorg
@@ -18,14 +18,14 @@ done
 
 echo "Using DISPLAY=:$DISP"
 
-Xephyr ":$DISP" -screen "$SCREEN" -resizeable -ac &
-XEPHYR_PID=$!
-
 cleanup() {
     kill "$ELECTRON_PID" "$OPENBOX_PID" "$XEPHYR_PID" 2>/dev/null || true
 }
 trap cleanup EXIT INT TERM
 
+Xephyr ":$DISP" -screen "$SCREEN" -resizeable -ac &
+XEPHYR_PID=$!
+
 sleep 1
 
 DISPLAY=":$DISP" openbox &
@@ -35,12 +35,23 @@ sleep 0.5
 
 DISPLAY=":$DISP" electron "$APP_ENTRY" &
 ELECTRON_PID=$!
+DISPLAY=":$DISP" xsetroot -solid "#009999"
+
+while :; do
+    if ! kill -0 "$ELECTRON_PID" 2>/dev/null; then
+        echo "Electron exited — killing Xephyr"
+        kill "$XEPHYR_PID" 2>/dev/null || true
+        break
+    fi
+
+    if ! kill -0 "$XEPHYR_PID" 2>/dev/null; then
+        echo "Xephyr exited — killing Electron"
+        kill "$ELECTRON_PID" 2>/dev/null || true
+        break
+    fi
 
-# monitor X server — when it dies, kill Electron
-while kill -0 "$XEPHYR_PID" 2>/dev/null; do
     sleep 0.5
 done
 
-echo "Xephyr exited — killing Electron"
-kill "$ELECTRON_PID" 2>/dev/null || true
 wait "$ELECTRON_PID" 2>/dev/null || true
+wait "$XEPHYR_PID" 2>/dev/null || true