diff --git a/packages/theme/src/client/composables/darkMode.ts b/packages/theme/src/client/composables/darkMode.ts
index 7071f727..acd3115c 100644
--- a/packages/theme/src/client/composables/darkMode.ts
+++ b/packages/theme/src/client/composables/darkMode.ts
@@ -1,4 +1,4 @@
-import { inject, provide, ref } from 'vue'
+import { inject, onMounted, provide, ref } from 'vue'
 import type { InjectionKey, Ref } from 'vue'
 
 export type DarkModeRef = Ref<boolean>
@@ -23,11 +23,10 @@ export const useDarkMode = (): DarkModeRef => {
  */
 export const setupDarkMode = (): void => {
   const isDark = ref<boolean>(false)
-  if (
-    typeof document !== 'undefined' &&
-    document.documentElement.classList.contains('dark')
-  ) {
-    isDark.value = true
-  }
+  onMounted(() => {
+    if (document.documentElement.classList.contains('dark')) {
+      isDark.value = true
+    }
+  })
   provide(darkModeSymbol, isDark)
 }
diff --git a/packages/theme/src/client/styles/code.scss b/packages/theme/src/client/styles/code.scss
index 01e73c19..5b068535 100644
--- a/packages/theme/src/client/styles/code.scss
+++ b/packages/theme/src/client/styles/code.scss
@@ -276,8 +276,8 @@ div[class*='language-'] {
     }
   }
 
-  .code-tabs-nav {
-    margin-bottom: -0.85rem;
+  .plume-content .vp-code-tabs-nav {
+    margin: 0 -1.5rem -0.85rem;
   }
 }
 
diff --git a/packages/theme/src/node/defaultOptions.ts b/packages/theme/src/node/defaultOptions.ts
index e8fdbacb..345da96d 100644
--- a/packages/theme/src/node/defaultOptions.ts
+++ b/packages/theme/src/node/defaultOptions.ts
@@ -19,16 +19,21 @@ export const mergeLocaleOptions = (options: PlumeThemeLocaleOptions) => {
   if (!options.locales) {
     options.locales = {}
   }
-  if (!options.locales['/']) {
-    options.locales['/'] = {}
+  const { locales, ...otherOptions } = options
+
+  if (!locales['/']) {
+    locales['/'] = {}
   }
   Object.assign(options, {
     ...defaultLocaleOption,
     ...options,
   })
-  Object.assign(options.locales['/'], {
+
+  Object.assign(locales['/'], {
     ...defaultLocaleOption,
-    ...options.locales['/'],
+    ...JSON.parse(JSON.stringify(otherOptions)),
+    ...locales['/'],
   })
+
   return options
 }