diff --git a/OAuth2-Backend-Approach.md b/OAuth2-Backend-Approach.md
index 7a4beaa..9653e5c 100644
--- a/OAuth2-Backend-Approach.md
+++ b/OAuth2-Backend-Approach.md
@@ -35,7 +35,7 @@ A way for the `user` to tell `google` to give an access to `xorismesiti.gr` app
     3. Google **response** to Back with profile data
     4. Back **response** to Front with profile data
 
-<br><br>
+<br><br><br>
 
 
 
@@ -66,6 +66,7 @@ Content-Length: 0
 
 *Security: the state string should be validated upon receiving the response from Google, as it ensures that the response corresponds to the request.*
 
+<br><br><br>
 
 
 
@@ -100,7 +101,11 @@ client_secret=PASS1234
   "scope": "email profile"
 }
 ```
-### 3. Back **response** to Front
+
+### 3. Backend **response** to Front
+
+<details>
+<summary><h4>Backend code</h4></summary>
 
 ```js
 // Backend callback URL: http://localhost:3000/auth/google/callback
@@ -134,8 +139,9 @@ app.get('/auth/google/callback', async (req, res) => {
 });
 ```
 
+</details>
 
-
+<br><br><br>
 
 
 
@@ -175,7 +181,7 @@ curl -X GET "https://www.googleapis.com/oauth2/v3/userinfo" \
 }
 ```
 
-### 4. Back **response** to Front with profile data
+### 4. Backend **response** to Front with profile data
 
 ```
 {