diff --git a/docusaurus.config.js b/docusaurus.config.js
index 3f1b2cec18..db5503db29 100644
--- a/docusaurus.config.js
+++ b/docusaurus.config.js
@@ -61,6 +61,11 @@ const config = {
           customCss: ['./src/css/custom.css'],
         },
       }),
+      {
+        googleTagManager: {
+          containerId: 'GTM-PL77JR5L',
+        },
+      },
     ],
   ],
 
@@ -109,6 +114,11 @@ const config = {
         theme: lightCodeTheme,
         darkTheme: darkCodeTheme,
       },
+      colorMode: {
+        defaultMode: 'dark',
+        disableSwitch: false,
+        respectPrefersColorScheme: false,
+      },
     }),
 
   plugins: [
diff --git a/src/css/custom.css b/src/css/custom.css
index cdf4275a59..a5e32508ea 100644
--- a/src/css/custom.css
+++ b/src/css/custom.css
@@ -55,7 +55,7 @@ a[href^="http"] {
   text-decoration: underline;
 }
 
-a[href^="/"]:not([class^="menu__link"]):not([class^="sidebarItemLink"]):not([class^="navbar__item"]):not([itemprop^="url"]):not([class^="navbar__title"]):not([class^="tag_node_modules"]) {
+a[href^="/"]:not([class^="menu__link"]):not([class^="sidebarItemLink"]):not([class^="navbar__item"]):not([itemprop^="url"]):not([class^="navbar__title"]):not([class^="tag_"]) {
   font-style: italic;
   text-decoration: underline;
 }