diff --git a/src/app/content/App.tsx b/src/app/content/App.tsx
index 7ff010a..0d51785 100644
--- a/src/app/content/App.tsx
+++ b/src/app/content/App.tsx
@@ -14,7 +14,7 @@ import { Toaster } from 'sonner'
 import DanmakuContainer from './components/DanmakuContainer'
 import DanmakuDomain from '@/domain/Danmaku'
 import AppStatusDomain from '@/domain/AppStatus'
-import { cn } from '@/utils'
+import { checkDarkMode, cn } from '@/utils'
 
 /**
  * Fix requestAnimationFrame error in jest
@@ -52,8 +52,6 @@ export default function App() {
     }
   }, [userInfoSetFinished, messageListLoadFinished])
 
-  const danmakuContainerRef = useRef<HTMLDivElement>(null)
-
   useEffect(() => {
     danmakuIsEnabled && send(danmakuDomain.command.MountCommand(danmakuContainerRef.current!))
     return () => {
@@ -61,8 +59,17 @@ export default function App() {
     }
   }, [danmakuIsEnabled])
 
+  const themeMode =
+    userInfo?.themeMode === 'system'
+      ? checkDarkMode()
+        ? 'dark'
+        : 'light'
+      : (userInfo?.themeMode ?? (checkDarkMode() ? 'dark' : 'light'))
+
+  const danmakuContainerRef = useRef<HTMLDivElement>(null)
+
   return (
-    <div id="app" className={cn('contents', userInfo?.themeMode)}>
+    <div id="app" className={cn('contents', themeMode)}>
       {appStatusLoadIsFinished && (
         <>
           <AppMain>
@@ -72,7 +79,7 @@ export default function App() {
             {notUserInfo && <Setup></Setup>}
             <Toaster
               richColors
-              theme={userInfo?.themeMode}
+              theme={themeMode}
               offset="70px"
               visibleToasts={1}
               toastOptions={{
diff --git a/src/app/content/views/AppButton/index.tsx b/src/app/content/views/AppButton/index.tsx
index e30fd53..ff78511 100644
--- a/src/app/content/views/AppButton/index.tsx
+++ b/src/app/content/views/AppButton/index.tsx
@@ -7,7 +7,7 @@ import { Button } from '@/components/ui/Button'
 import { EVENT } from '@/constants/event'
 import UserInfoDomain from '@/domain/UserInfo'
 import useTriggerAway from '@/hooks/useTriggerAway'
-import { checkSystemDarkMode, cn } from '@/utils'
+import { checkDarkMode, cn } from '@/utils'
 import LogoIcon0 from '@/assets/images/logo-0.svg'
 import LogoIcon1 from '@/assets/images/logo-1.svg'
 import LogoIcon2 from '@/assets/images/logo-2.svg'
@@ -36,8 +36,7 @@ const AppButton: FC<AppButtonProps> = ({ className }) => {
 
   const DayLogo = [LogoIcon0, LogoIcon1, LogoIcon2, LogoIcon3, LogoIcon4, LogoIcon5, LogoIcon6][getDay(Date())]
 
-  const isDarkMode =
-    userInfo?.themeMode === 'dark' ? true : userInfo?.themeMode === 'light' ? false : checkSystemDarkMode()
+  const isDarkMode = userInfo?.themeMode === 'dark' ? true : userInfo?.themeMode === 'light' ? false : checkDarkMode()
 
   const [menuOpen, setMenuOpen] = useState(false)
 
diff --git a/src/app/content/views/Setup/index.tsx b/src/app/content/views/Setup/index.tsx
index 73ea209..c2cedf7 100644
--- a/src/app/content/views/Setup/index.tsx
+++ b/src/app/content/views/Setup/index.tsx
@@ -2,7 +2,7 @@ import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/Avatar'
 import { MAX_AVATAR_SIZE } from '@/constants/config'
 import MessageListDomain, { Message, MessageType } from '@/domain/MessageList'
 import UserInfoDomain, { UserInfo } from '@/domain/UserInfo'
-import { checkSystemDarkMode, generateRandomAvatar, generateRandomName } from '@/utils'
+import { generateRandomAvatar, generateRandomName } from '@/utils'
 import { UserIcon } from 'lucide-react'
 import { nanoid } from 'nanoid'
 import { FC, useEffect, useState } from 'react'
@@ -39,7 +39,7 @@ const generateUserInfo = async (): Promise<UserInfo> => {
     name: generateRandomName(),
     avatar: await generateRandomAvatar(MAX_AVATAR_SIZE),
     createTime: Date.now(),
-    themeMode: checkSystemDarkMode() ? 'dark' : 'system',
+    themeMode: 'system',
     danmakuEnabled: true,
     notificationEnabled: true,
     notificationType: 'all'
diff --git a/src/app/options/components/ProfileForm.tsx b/src/app/options/components/ProfileForm.tsx
index f3bb1b0..48d7f19 100644
--- a/src/app/options/components/ProfileForm.tsx
+++ b/src/app/options/components/ProfileForm.tsx
@@ -9,7 +9,7 @@ import { Button } from '@/components/ui/Button'
 import { Form, FormControl, FormDescription, FormField, FormItem, FormLabel, FormMessage } from '@/components/ui/Form'
 import { Input } from '@/components/ui/Input'
 import UserInfoDomain, { type UserInfo } from '@/domain/UserInfo'
-import { checkSystemDarkMode, cn, generateRandomAvatar } from '@/utils'
+import { cn, generateRandomAvatar } from '@/utils'
 import { RadioGroup, RadioGroupItem } from '@/components/ui/RadioGroup'
 import { Label } from '@/components/ui/Label'
 import { RefreshCcwIcon } from 'lucide-react'
@@ -24,7 +24,7 @@ const defaultUserInfo: UserInfo = {
   name: '',
   avatar: '',
   createTime: Date.now(),
-  themeMode: checkSystemDarkMode() ? 'dark' : 'system',
+  themeMode: 'system',
   danmakuEnabled: true,
   notificationEnabled: true,
   notificationType: 'all'
diff --git a/src/domain/Toast.ts b/src/domain/Toast.ts
index 32c1abb..fe43f11 100644
--- a/src/domain/Toast.ts
+++ b/src/domain/Toast.ts
@@ -13,7 +13,7 @@ const ToastDomain = Remesh.domain({
       name: 'Toast.OnRoomSelfJoinRoomEffect',
       impl: ({ fromEvent }) => {
         const onRoomJoin$ = fromEvent(roomDomain.event.SelfJoinRoomEvent).pipe(
-          map(() => toastModule.command.LoadingCommand('Connected to the chat.'))
+          map(() => toastModule.command.LoadingCommand({ message: 'Connected to the chat.', duration: 3000 }))
         )
 
         return onRoomJoin$
diff --git a/src/utils/checkDarkMode.ts b/src/utils/checkDarkMode.ts
new file mode 100644
index 0000000..8dd91f4
--- /dev/null
+++ b/src/utils/checkDarkMode.ts
@@ -0,0 +1,11 @@
+const checkDarkMode = () => {
+  const colorScheme = document.documentElement.style.getPropertyValue('color-scheme').trim()
+
+  if (colorScheme === 'dark') {
+    return true // Prefer the website's color-scheme property value
+  }
+
+  return window.matchMedia('(prefers-color-scheme: dark)').matches // Otherwise, check the system theme
+}
+
+export default checkDarkMode
diff --git a/src/utils/checkSystemDarkMode.ts b/src/utils/checkSystemDarkMode.ts
deleted file mode 100644
index ac1f58a..0000000
--- a/src/utils/checkSystemDarkMode.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-const checkSystemDarkMode = () => window.matchMedia('(prefers-color-scheme: dark)').matches
-
-export default checkSystemDarkMode
diff --git a/src/utils/index.ts b/src/utils/index.ts
index d5e36d2..a52912f 100644
--- a/src/utils/index.ts
+++ b/src/utils/index.ts
@@ -4,7 +4,7 @@ export { default as createElement } from './createElement'
 export { default as getSiteInfo } from './getSiteInfo'
 export { default as compressImage } from './compressImage'
 export { default as isNullish } from './isNullish'
-export { default as checkSystemDarkMode } from './checkSystemDarkMode'
+export { default as checkDarkMode } from './checkDarkMode'
 export { default as stringToHex } from './stringToHex'
 export { default as debounce } from './debounce'
 export { default as throttle } from './throttle'