diff --git a/OAuth2.md b/OAuth2.md
index d2e6c8b..b971a01 100644
--- a/OAuth2.md
+++ b/OAuth2.md
@@ -52,7 +52,7 @@ GET https://accounts.google.com/o/oauth2/v2/auth?
 The frontend must not directly exchange the `code` for an `access_token`. Instead, it sends the `code` to the backend via an API request.
 
 <details>
-<summary>Code:</summary>
+<summary><h3>Frontend Code:</h3></summary>
 
 ```js
 // On the backend callback URL, the frontend receives the authorization code
@@ -122,7 +122,7 @@ client_secret=YOUR_GOOGLE_CLIENT_SECRET
 ```
 
 <details>
-<summary>Code:</summary>
+<summary><h3>Backend Code:</h3></summary>
 
 ```js
 const express = require('express');