diff --git a/index.html b/index.html
index d49831d..853ce8c 100644
--- a/index.html
+++ b/index.html
@@ -26,6 +26,7 @@
     <meta name="theme-color" content="#000000" />
 
     <link id="favicon" rel="shortcut icon" href="./public/favicon.ico" />
+    <link rel="stylesheet" href="/mx-uc.css" />
 
     <link rel="manifest" href="/manifest.json" />
     <meta name="mobile-web-app-capable" content="yes" />
diff --git a/public/mx-uc.css b/public/mx-uc.css
new file mode 100644
index 0000000..bc866de
--- /dev/null
+++ b/public/mx-uc.css
@@ -0,0 +1,4 @@
+:root {
+  --mx-uc--sup39-chat_sup39_dev: #2ee5b8;
+  /* --mx-uc--naskya-chat_naskya_net: ; */
+}
diff --git a/vite.config.js b/vite.config.js
index 294bcfe..fae70b2 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -33,6 +33,10 @@ const copyFiles = {
       src: 'public/res/android',
       dest: 'public/',
     },
+    {
+      src: 'public/mx-uc.css',
+      dest: '',
+    },
     {
       src: 'twemoji/assets/svg/*',
       dest: 'twemoji/',