diff --git a/index.html b/index.html
index c2090c0..4dba7f3 100644
--- a/index.html
+++ b/index.html
@@ -1,15 +1,45 @@
 <!DOCTYPE html>
 <html lang="ko">
   <head>
+    <!-- Google tag (gtag.js) -->
+    <script
+      async
+      src="https://www.googletagmanager.com/gtag/js?id=G-YTMN5V74G8"
+    ></script>
+    <script>
+      window.dataLayer = window.dataLayer || [];
+      function gtag() {
+        dataLayer.push(arguments);
+      }
+      gtag("js", new Date());
+
+      gtag("config", "G-YTMN5V74G8");
+    </script>
     <meta charset="UTF-8" />
     <link rel="icon" href="/favicon.ico" />
     <link rel="shortcut icon" href="logo.png" />
     <link rel="apple-touch-icon" href="logo.png" />
     <link rel="manifest" href="/manifest.json" />
-    <link rel="apple-touch-icon" sizes="192x192" href="/icons/icon-192x192.png">
-    <link rel="apple-touch-icon" sizes="256x256" href="/icons/icon-256x256.png">
-    <link rel="apple-touch-icon" sizes="384x384" href="/icons/icon-384x384.png">
-    <link rel="apple-touch-icon" sizes="512x512" href="/icons/icon-512x512.png">
+    <link
+      rel="apple-touch-icon"
+      sizes="192x192"
+      href="/icons/icon-192x192.png"
+    />
+    <link
+      rel="apple-touch-icon"
+      sizes="256x256"
+      href="/icons/icon-256x256.png"
+    />
+    <link
+      rel="apple-touch-icon"
+      sizes="384x384"
+      href="/icons/icon-384x384.png"
+    />
+    <link
+      rel="apple-touch-icon"
+      sizes="512x512"
+      href="/icons/icon-512x512.png"
+    />
     <meta
       name="viewport"
       content="user-scalable=no, width=device-width, initial-scale=1.0, maximum-scale=1.0"
