diff --git a/frontend/src/pages/Chat.tsx b/frontend/src/pages/Chat.tsx
index ce354f8..f6434dd 100644
--- a/frontend/src/pages/Chat.tsx
+++ b/frontend/src/pages/Chat.tsx
@@ -149,8 +149,8 @@ const ChatMessageItem: FC<{
       className={classnames(
         'flex p-2 rounded-lg overflow-hidden',
         editing ? 'grow' : '',
-        messageItem.side === 'left' ? 'bg-gray-200' : 'bg-blue-500',
-        messageItem.side === 'left' ? 'text-gray-600' : 'text-white'
+        commonStore.settings.darkMode ? 'bg-neutral-800 border-neutral-600 border-[1px]' : (messageItem.side === 'left' ? 'bg-gray-200' : 'bg-blue-500'),
+        commonStore.settings.darkMode ? 'text-white' : (messageItem.side === 'left' ? 'text-gray-600' : 'text-white')
       )}
     >
       {!editing ?
diff --git a/frontend/src/startup.ts b/frontend/src/startup.ts
index de0100c..5fc3414 100644
--- a/frontend/src/startup.ts
+++ b/frontend/src/startup.ts
@@ -81,6 +81,7 @@ async function initConfig() {
   }).catch(() => {
     commonStore.setModelConfigs(commonStore.platform !== 'darwin' ? defaultModelConfigs : defaultModelConfigsMac, true);
   });
+  commonStore.setSettings({}, false); // to activate side effects
 }
 
 async function initCache(initUnfinishedModels: boolean) {
diff --git a/frontend/src/stores/commonStore.ts b/frontend/src/stores/commonStore.ts
index d7e6cf8..06bce6f 100644
--- a/frontend/src/stores/commonStore.ts
+++ b/frontend/src/stores/commonStore.ts
@@ -259,13 +259,18 @@ class CommonStore {
   setSettings = (value: Partial<SettingsType>, saveConfig: boolean = true) => {
     this.settings = { ...this.settings, ...value };
 
-    if (this.settings.darkMode)
+    if (this.settings.darkMode) {
       WindowSetDarkTheme();
-    else
+      document.documentElement.setAttribute('style', 'color-scheme: dark;');
+    } else {
       WindowSetLightTheme();
+      document.documentElement.setAttribute('style', 'color-scheme: light;');
+    }
 
-    if (this.settings.language)
+    if (this.settings.language) {
       i18n.changeLanguage(this.settings.language);
+      document.documentElement.setAttribute('lang', this.settings.language === 'dev' ? 'en' : this.settings.language);
+    }
 
     if (saveConfig)
       saveConfigs();
diff --git a/frontend/src/webWails.js b/frontend/src/webWails.js
index c311584..acf2ce4 100644
--- a/frontend/src/webWails.js
+++ b/frontend/src/webWails.js
@@ -127,7 +127,11 @@ if (!window.go) {
     return ''
   })
   defineApp('ReadJson', async (fileName) => {
-    return JSON.parse(localStorage.getItem(fileName))
+    const data = JSON.parse(localStorage.getItem(fileName))
+    if (data)
+      return data
+    else
+      throw new Error('File not found')
   })
   defineApp('SaveJson', async (fileName, data) => {
     localStorage.setItem(fileName, JSON.stringify(data))