diff --git a/browser/index.html b/browser/index.html
new file mode 100644
index 0000000..2a6244b
--- /dev/null
+++ b/browser/index.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Hi Language Playground</title>
+    <style>
+        body { font-family: sans-serif; display: flex; height: 100vh; margin: 0; gap: 10px; padding: 10px; box-sizing: border-box; }
+        textarea { width: 50%; height: 95%; padding: 10px; border: 1px solid #ccc; border-radius: 4px; font-family: monospace; font-size: 14px; }
+    </style>
+</head>
+<body>
+    <textarea id="hi-input" placeholder="Enter .hi code here..."></textarea>
+    <textarea id="js-output" readonly placeholder="JavaScript output..."></textarea>
+
+    <script type="module" src="app.js"></script>
+</body>
+</html>
