diff --git a/OAuth2-Front-Approach.md b/OAuth2-Front-Approach.md
index 66f3aca..17622ef 100644
--- a/OAuth2-Front-Approach.md
+++ b/OAuth2-Front-Approach.md
@@ -50,7 +50,7 @@ A way for the `user` to tell `google` to give an access token to `xorismesiti.gr
 <br>
 
 <details>
-<summary><h3>HTTP GET Request from Frontend to Google</h3></summary>
+<summary><h2>HTTP GET Request from Frontend to Google</h2></summary>
 
 ```sh
 GET https://accounts.google.com/o/oauth2/v2/auth?
@@ -70,7 +70,7 @@ GET https://accounts.google.com/o/oauth2/v2/auth?
 </details>
 
 <details>
-<summary><h3>HTTP GET Response from Google to Frontend </h3></summary>
+<summary><h2>HTTP GET Response from Google to Frontend </h2></summary>
 
 ```bash
 HTTP/1.1 302 Found
@@ -82,7 +82,7 @@ Content-Length: 0
 </details>
 
 <details>
-<summary><h3>Frontend Code</h3></summary>
+<summary><h2>Frontend Code</h2></summary>
 
 ```js
 // Redirect to Google's OAuth 2.0 endpoint when user clicks login
@@ -117,7 +117,7 @@ const loginWithGoogle = () => {
 Now that the frontend has the Authorization `code` on the callback url, it can send it to the backend
 
 <details>
-<summary><h3>HTTP POST Request from Frontend to Backend</h3></summary>
+<summary><h2>HTTP POST Request from Frontend to Backend</h2></summary>
 
 ```bash
 POST https://xorismesiti.gr/api/auth/exchange-token
@@ -132,7 +132,7 @@ Content-Type: application/json
 
 
 <details>
-<summary><h3>Frontend Code</h3></summary>
+<summary><h2>Frontend Code</h2></summary>
 
 ```js
 // On the backend callback URL, the frontend receives the authorization code
@@ -186,7 +186,7 @@ export default Callback;
 <br>
 
 <details>
-<summary><h3>HTTP POST Request from Backend to Google</h3></summary>
+<summary><h2>HTTP POST Request from Backend to Google</h2></summary>
 
 ```sh
 POST https://oauth2.googleapis.com/token
@@ -213,7 +213,7 @@ client_secret=PASS1234
 </details>
 
 <details>
-<summary><h3>HTTP POST Response from Google to Backend</h3></summary>
+<summary><h2>HTTP POST Response from Google to Backend</h2></summary>
 
 ```json
 {
@@ -228,7 +228,7 @@ client_secret=PASS1234
 </details>
 
 <details>
-<summary><h3>Backend Code:</h3></summary>
+<summary><h2>Backend Code:</h2></summary>
 
 ```js
 const express = require('express');
@@ -286,7 +286,7 @@ and saves them in a cookie marked as `HTTP-only` and `Secure`
 Now its ready to use the tokens to get the user data from Google
 
 <details>
-<summary><h3>HTTP Response from Backend to Frontend</h3></summary>
+<summary><h2>HTTP Response from Backend to Frontend</h2></summary>
 
 ```json
 {
@@ -303,7 +303,7 @@ Now its ready to use the tokens to get the user data from Google
 
 
 <details>
-<summary><h3>Frontend Code:</h3></summary>
+<summary><h2>Frontend Code:</h2></summary>
 
 ```js
 // Set an HTTP-only, Secure cookie on the backend
@@ -334,7 +334,7 @@ res.cookie('access_token', accessToken, {
 <br>
 
 <details>
-<summary><h3>HTTP GET Request from Frontend to Backend</h3></summary>
+<summary><h2>HTTP GET Request from Frontend to Backend</h2></summary>
 
 ```bash
 GET https://www.googleapis.com/oauth2/v3/userinfo
@@ -344,7 +344,7 @@ Authorization: Bearer ACCESSTOKEN6zXZkHi2XITkDoOVACCESSTOKEN
 </details>
 
 <details>
-<summary><h3>HTTP GET Response from Backend to Frontend</h3></summary>
+<summary><h2>HTTP GET Response from Backend to Frontend</h2></summary>
 
 ```json
 {
@@ -363,7 +363,7 @@ Authorization: Bearer ACCESSTOKEN6zXZkHi2XITkDoOVACCESSTOKEN
 </details>
 
 <details>
-<summary><h3>Frontend Code</h3></summary>
+<summary><h2>Frontend Code</h2></summary>
 
 ```js
 const fetchUserData = async (accessToken) => {
@@ -412,7 +412,7 @@ const fetchUserData = async (accessToken) => {
 If the access token is expired, the frontend will receive an error response from Google when attempting to fetch user data
 
 <details>
-<summary><h3>HTTP GET Request from Frontend to Google</h3></summary>
+<summary><h2>HTTP GET Request from Frontend to Google</h2></summary>
 
 ```bash
 GET https://www.googleapis.com/oauth2/v3/userinfo
@@ -422,7 +422,7 @@ Authorization: Bearer ACCESSTOKEN6zXZkHi2XITkDoOVACCESSTOKEN
 </details>
 
 <details>
-<summary><h3>HTTP GET Response from Google to Frontend</h3></summary>
+<summary><h2>HTTP GET Response from Google to Frontend</h2></summary>
 
 ```json
 {
@@ -435,7 +435,7 @@ Authorization: Bearer ACCESSTOKEN6zXZkHi2XITkDoOVACCESSTOKEN
 
 
 <details>
-<summary><h3>HTTP POST Refresh token from Frontend to Backend</h3></summary>
+<summary><h2>HTTP POST Refresh token from Frontend to Backend</h2></summary>
 
 ```bash
 
@@ -444,7 +444,7 @@ Authorization: Bearer ACCESSTOKEN6zXZkHi2XITkDoOVACCESSTOKEN
 </details>
 
 <details>
-<summary><h3>Frontend Code</h3></summary>
+<summary><h2>Frontend Code</h2></summary>
 
 ```js
 const refreshAccessToken = async (refreshToken) => {
@@ -473,7 +473,7 @@ const refreshAccessToken = async (refreshToken) => {
 
 
 <details>
-<summary><h3>Frontend Code</h3></summary>
+<summary><h2>Frontend Code</h2></summary>
 
 ```js
 const response = await fetch('https://oauth2.googleapis.com/token', {