diff --git a/_share/media/js/collapsible.js b/_share/media/js/collapsible.js
new file mode 100644
index 0000000..ded1a8a
--- /dev/null
+++ b/_share/media/js/collapsible.js
@@ -0,0 +1,17 @@
+document.addEventListener('DOMContentLoaded', function() {
+ var headers = document.querySelectorAll('h4');
+
+ headers.forEach(function(header) {
+ header.addEventListener('click', function() {
+ var nextElement = header.nextElementSibling;
+ if (nextElement) {
+ var collapsibleList = nextElement.querySelector('.playlist, .notes, .contents');
+ if (collapsibleList) {
+ header.classList.toggle('active');
+ collapsibleList.classList.toggle('active');
+ }
+ }
+ });
+ });
+});
+
diff --git a/_share/media/sass/collapsible.sass b/_share/media/sass/collapsible.sass
new file mode 100644
index 0000000..f5ba439
--- /dev/null
+++ b/_share/media/sass/collapsible.sass
@@ -0,0 +1,20 @@
+h4
+ cursor: pointer
+ &:after
+ content: "▸"
+ font-size: 0.8em
+ margin-left: 10px
+ transition: transform 0.2s
+
+ &.active:after
+ transform: rotate(90deg)
+
+div.outline-text-4
+ display: block
+
+ .playlist, .notes, .contents
+ display: none
+
+ &.active
+ display: block
+
diff --git a/mba-main.org b/mba-main.org
index 13b5dd0..4a209b2 100644
--- a/mba-main.org
+++ b/mba-main.org
@@ -1,6 +1,6 @@
#+title: An Entire MBA in 1 Course - Chris Haroun
#+HTML_HEAD:
-#+HTML_HEAD:
+#+HTML_HEAD:
* Table of Contents
** Section 1 - Launching a new company
diff --git a/mba/ch13.org b/mba/ch13.org
index f24b8e7..ac705d2 100644
--- a/mba/ch13.org
+++ b/mba/ch13.org
@@ -1,10 +1,12 @@
-#+title: How to Present
+#+title: Section 2| Lesson 13 - How to Present like Steve Jobs
#+HTML_HEAD:
#+HTML_HEAD:
-[[./../mba-main.org][Business TOC]]
+* Links
+- [[./../mba-main.org][