diff --git a/index.html b/index.html
index e9564a3ea..d0d6714d4 100644
--- a/index.html
+++ b/index.html
@@ -5,6 +5,20 @@
     <link rel="icon" type="image/svg+xml" href="/vite.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>RapidModel</title>
+    <style>
+      /* Inline critical styles to prevent flash of unstyled content */
+      html, body {
+        margin: 0;
+        padding: 0;
+        background-color: #1a1a1a;
+        color: #e0e0e0;
+      }
+      #app {
+        width: 100vw;
+        height: 100vh;
+        background-color: #1a1a1a;
+      }
+    </style>
   </head>
   <body>
     <div id="app"></div>
