diff --git a/docs/docusaurus.config.ts b/docs/docusaurus.config.ts
index d5dd57b..8c1b2e4 100644
--- a/docs/docusaurus.config.ts
+++ b/docs/docusaurus.config.ts
@@ -49,6 +49,11 @@ const config: Config = {
   themeConfig: {
     // Replace with your project's social card
     // image: 'img/docusaurus-social-card.jpg',
+    colorMode: {
+      defaultMode: 'dark',
+      disableSwitch: false,
+      respectPrefersColorScheme: true,
+    },
     navbar: {
       title: 'Penman JS',
       // logo: {