diff --git a/aux/flatpak/space.arimelody.LiveSchedule.json b/aux/flatpak/space.arimelody.LiveSchedule.json
index aad748e..9786ab7 100644
--- a/aux/flatpak/space.arimelody.LiveSchedule.json
+++ b/aux/flatpak/space.arimelody.LiveSchedule.json
@@ -1,7 +1,7 @@
 {
     "id" : "space.arimelody.LiveSchedule",
     "runtime" : "org.gnome.Platform",
-    "runtime-version" : "48",
+    "runtime-version" : "master",
     "sdk" : "org.gnome.Sdk",
     "command" : "liveschedule",
     "finish-args" : [
diff --git a/main.js b/main.js
index 2c034a2..60b92df 100644
--- a/main.js
+++ b/main.js
@@ -14,6 +14,8 @@ let schedule = {
 
 const offlineTitle = 'OFFLINE';
 const offlineSubtitle = 'takin a nap';
+let copyClipboard;
+let saveImage;
 
 document.addEventListener('readystatechange', () => {
     document.getElementById('version').innerText = VERSION;
@@ -118,7 +120,7 @@ if ('webkit' in window && 'messageHandlers' in window.webkit) {
   let _promiseId = 0;
   let _promises = new Map();
 
-  window.webkit.messageHandlers._nativePromiseResolved.addEventListener('message', (event) => {
+  window.addEventListener('message', (event) => {
     const [id] = event.detail;
     const [resolve,] = _promises.get(id) ?? [];
     if (!resolve) return;
@@ -126,7 +128,7 @@ if ('webkit' in window && 'messageHandlers' in window.webkit) {
     resolve();
   });
 
-  window.webkit.messageHandlers._nativePromiseRejected.addEventListener('message', (event) => {
+  window.addEventListener('message', (event) => {
     const [id] = event.detail;
     const [,reject] = _promises.get(id) ?? [];
     if (!reject) return;
@@ -134,45 +136,41 @@ if ('webkit' in window && 'messageHandlers' in window.webkit) {
     reject();
   });
 
-  function copyClipboard() {
-    return new Promise((resolve, reject) => {
-      const thisPromiseId = ++promiseId;
+  copyClipboard = () => new Promise((resolve, reject) => {
+    const thisPromiseId = ++_promiseId;
 
-      _promises.set(thisPromiseId, [resolve, reject]);
+    _promises.set(thisPromiseId, [resolve, reject]);
 
-      const schedule = document.getElementById('schedule');
-      const boundingRect = getBoundingClientRect();
+    const schedule = document.getElementById('schedule');
+    const boundingRect = schedule.getBoundingClientRect();
 
-      window.webkit.messageHandlers.copySnapshot.postMessage([
-        thisPromiseId,
-        'clipboard',
-        boundingRect.x,
-        boundingRect.y,
-        boundingRect.width,
-        boundingRect.height,
-      ]);
-    });
-  }
+    window.webkit.messageHandlers.copySnapshot.postMessage([
+      thisPromiseId,
+      'clipboard',
+      boundingRect.x + 1,
+      boundingRect.y + 1,
+      boundingRect.width - 2,
+      boundingRect.height - 2,
+    ]);
+  });
 
-  function saveImage() {
-    return new Promise((resolve, reject) => {
-      const thisPromiseId = ++promiseId;
+  saveImage = () => new Promise((resolve, reject) => {
+    const thisPromiseId = ++_promiseId;
 
-      _promises.set(thisPromiseId, [resolve, reject]);
+    _promises.set(thisPromiseId, [resolve, reject]);
 
-      const schedule = document.getElementById('schedule');
-      const boundingRect = getBoundingClientRect();
+    const schedule = document.getElementById('schedule');
+    const boundingRect = schedule.getBoundingClientRect();
 
-      window.webkit.messageHandlers.copySnapshot.postMessage([
-        thisPromiseId,
-        'file',
-        boundingRect.x,
-        boundingRect.y,
-        boundingRect.width,
-        boundingRect.height,
-      ]);
-    });
-  }
+    window.webkit.messageHandlers.copySnapshot.postMessage([
+      thisPromiseId,
+      'file',
+      boundingRect.x + 1,
+      boundingRect.y + 1,
+      boundingRect.width - 2,
+      boundingRect.height - 2,
+    ]);
+  });
 
   document.getElementById('clipboard').removeAttribute('disabled');
   document.getElementById('save-image').removeAttribute('disabled');
diff --git a/native/src/ls-web-view.c b/native/src/ls-web-view.c
index 1f18003..cbafdac 100644
--- a/native/src/ls-web-view.c
+++ b/native/src/ls-web-view.c
@@ -34,11 +34,14 @@ static void ls_web_view_constructed(GObject *object) {
                                          ls_web_view_on_resource_request,
                                          NULL, NULL);
 
+  WebKitSettings *settings = webkit_web_view_get_settings(WEBKIT_WEB_VIEW(object));
+  webkit_settings_set_enable_developer_extras(settings, TRUE);
+
   WebKitUserContentManager *manager = webkit_web_view_get_user_content_manager(web_view);
+  webkit_user_content_manager_register_script_message_handler(manager, "copySnapshot", NULL);
   g_signal_connect(manager, "script-message-received::copySnapshot",
                    G_CALLBACK(ls_web_view_on_snapshot_message_received),
                    g_object_ref(object));
-  webkit_user_content_manager_register_script_message_handler(manager, "copySnapshot", NULL);
 
   webkit_web_view_load_uri(web_view, "gresource:///space/arimelody/LiveSchedule/webview/index.html");
 }