diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..01f93fb
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,13 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "gitsubmodule" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+      day: "sunday"
+      time: "22:59"
diff --git a/.github/workflows/call-deploy-book.yml b/.github/workflows/call-deploy-book.yml
index 63a17c0..43745e9 100644
--- a/.github/workflows/call-deploy-book.yml
+++ b/.github/workflows/call-deploy-book.yml
@@ -4,6 +4,7 @@ on:
   push:
     branches:
     - '**'
+    # - '!dependabot**'
     # If your git repository has the Jupyter Book within some-subfolder next to
     # unrelated files, you can make this run only if a file within that specific
     # folder (or the workflow file itself) has been modified.
diff --git a/.gitmodules b/.gitmodules
index f76fc05..3b0e585 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,33 +1,44 @@
 [submodule "book/external/Nested-Books"]
 	path = book/external/Nested-Books
 	url = https://github.com/TeachBooks/Nested-Books.git
+        branch = manual-description
 [submodule "book/external/template"]
 	path = book/external/template
 	url = https://github.com/TeachBooks/template.git
+        branch = manual_description
 [submodule "book/external/deploy-book-workflow"]
 	path = book/external/deploy-book-workflow
 	url = https://github.com/TeachBooks/deploy-book-workflow.git
+        branch = manual_docs
 [submodule "book/external/Useful_python_code"]
 	path = book/external/Useful_python_code
 	url = https://github.com/TeachBooks/Useful_python_code.git
+        branch = manual
 [submodule "book/external/Sphinx-Image-Inverter"]
 	path = book/external/Sphinx-Image-Inverter
 	url = https://github.com/TeachBooks/Sphinx-Image-Inverter.git
+        branch = Manual
 [submodule "book/external/JupyterBook-Patches"]
 	path = book/external/JupyterBook-Patches
 	url = https://github.com/TeachBooks/JupyterBook-Patches.git
+        branch = manual_docs
 [submodule "book/external/Download-Link-Replacer"]
 	path = book/external/Download-Link-Replacer
 	url = https://github.com/TeachBooks/Download-Link-Replacer.git
+        branch = manual_docs
 [submodule "book/external/Sphinx-Grasple-public"]
 	path = book/external/Sphinx-Grasple-public
 	url = https://github.com/TeachBooks/Sphinx-Grasple-public.git
+        branch = manual_docs
 [submodule "book/external/Sphinx-TUDelft-theme"]
 	path = book/external/Sphinx-TUDelft-theme
 	url = https://github.com/TeachBooks/Sphinx-TUDelft-theme.git
+        branch = Manual
 [submodule "book/external/teachbooks-sphinx-tippy"]
 	path = book/external/teachbooks-sphinx-tippy
 	url = https://github.com/TeachBooks/teachbooks-sphinx-tippy.git
+        branch = Manual
 [submodule "book/external/annotater"]
 	path = book/external/annotater
 	url = https://github.com/TeachBooks/annotater
+        branch = manual
\ No newline at end of file
diff --git a/README.md b/README.md
index 92cb94d..5f8fe45 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,6 @@ This book will continue to develop, so feel free to contribute https://github.co
 
 The released book can be found on on https://teachbooks.io/manual. This page shows the built book of the `release` branch All branches will also be visible as seen in the action's summaries: https://github.com/TeachBooks/mirror_teachbook_manual/actions
 
-Some parts of this book are taken from other sources in the form of submodules (linked in the folder [book/external](book/external)). To contribute to those pages, contribute to the source repository directly with a fork and merge/pull request. If you intent to clone this boko including its submodules, clone using: `git clone --recurse-submodules git@github.com:TeachBooks/manual.git`
+Some parts of this book are taken from other sources in the form of submodules (linked in the folder [book/external](book/external)). To contribute to those pages, contribute to the source repository directly with a fork and merge/pull request. If you intent to clone this book including its submodules, clone using: `git clone --recurse-submodules git@github.com:TeachBooks/manual.git`
 
 Happy book building!
diff --git a/book/_config.yml b/book/_config.yml
index 8c6fa4e..e1f3110 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -43,6 +43,10 @@ sphinx:
     html_static_path: ["images"]
     bibtex_default_style: myapastyle
     bibtex_reference_style: author_year_round
+    mathjax3_config:
+      tex:
+        macros:
+          "newcolor": ['\definecolor{newcolor}{RGB}{111, 29, 119}{\color{newcolor}#1}',1]
   local_extensions:
     apastyle: _ext/
     bracket_citation_style: _ext/
diff --git a/book/_static/color.css b/book/_static/color.css
new file mode 100644
index 0000000..8717fb4
--- /dev/null
+++ b/book/_static/color.css
@@ -0,0 +1,19 @@
+:root {
+    --newcolor-light: rgb(111, 29, 119);
+    --newcolor-dark: rgb(255, 167, 255);
+    --newcolor: var(--newcolor-light);
+}
+
+html[data-theme="dark"] {
+    --newcolor: var(--newcolor-dark);
+}
+
+.newcolor {color: var(--newcolor);}
+
+.newcolor-same {color: var(--newcolor-light);}
+
+.newcolor-filter {color: var(--newcolor-light);}
+
+html[data-theme="dark"] .newcolor-filter {
+    filter:  invert(1) hue-rotate(180deg) saturate(1.5);
+}
\ No newline at end of file
diff --git a/book/_toc.yml b/book/_toc.yml
index a7b0c7e..93856b4 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -79,6 +79,7 @@ parts:
       - file: external/Sphinx-TUDelft-theme/README.md
       - file: external/teachbooks-sphinx-tippy/README.md
       - file: features/apa
+      - file: features/custom_colors.md
     - file: features/students
       sections:
       - file: external/annotater/README.md
diff --git a/book/external/Nested-Books b/book/external/Nested-Books
index 3cf6152..51f0ba6 160000
--- a/book/external/Nested-Books
+++ b/book/external/Nested-Books
@@ -1 +1 @@
-Subproject commit 3cf61525f3985916805a59361935764d78e460df
+Subproject commit 51f0ba6754f0a5f95032e09482a7a28145687624
diff --git a/book/external/Sphinx-TUDelft-theme b/book/external/Sphinx-TUDelft-theme
index 35ecbdd..71399c6 160000
--- a/book/external/Sphinx-TUDelft-theme
+++ b/book/external/Sphinx-TUDelft-theme
@@ -1 +1 @@
-Subproject commit 35ecbddad78b567a0b2d1d4bdb513d8b95181348
+Subproject commit 71399c659b037a550a253e38ddacfb33e03cc882
diff --git a/book/external/deploy-book-workflow b/book/external/deploy-book-workflow
index ed2cdc8..317a9cc 160000
--- a/book/external/deploy-book-workflow
+++ b/book/external/deploy-book-workflow
@@ -1 +1 @@
-Subproject commit ed2cdc81be5036deb8da244814a946d17ece7708
+Subproject commit 317a9cc8607f74f29957b28a86450eccba6a4e2c
diff --git a/book/external/teachbooks-sphinx-tippy b/book/external/teachbooks-sphinx-tippy
index a80e764..3f9a5c2 160000
--- a/book/external/teachbooks-sphinx-tippy
+++ b/book/external/teachbooks-sphinx-tippy
@@ -1 +1 @@
-Subproject commit a80e7645bc5a377b3c75befdf29eb67934bb9ab7
+Subproject commit 3f9a5c2a72607d5e32c3a99649f37a5e6548e92a
diff --git a/book/features/custom_colors.md b/book/features/custom_colors.md
new file mode 100644
index 0000000..e004f9b
--- /dev/null
+++ b/book/features/custom_colors.md
@@ -0,0 +1,169 @@
+# Custom colors
+
+```{admonition} User types
+:class: tip
+This page is useful for user type 4 and 5.
+```
+
+Within these online books sometimes extra/new colors are wished for. In this page is shown how this can be achieved.
+
+## Using `definecolor`
+
+::::{warning}
+This method only works for $\LaTeX$  colors.
+::::
+
+::::{warning}
+In this case the color remains the same in ligt and dark mode.
+::::
+
+### Code in `_config.yml`
+
+```yaml
+sphinx:
+  config:
+    mathjax3_config:
+      tex:
+        macros:
+          "newcolor": ['\definecolor{newcolor}{RGB}{111, 29, 119}{\color{newcolor}#1}',1]
+```
+
+### Code in content
+
+```latex
+:::{math}
+\newcolor{\LaTeX}
+:::
+```
+
+### Result
+
+:::{math}
+\newcolor{\LaTeX}
+:::
+
+## Using CSS
+
+In this case one has three options:
+
+1. Light and dark mode the same color
+1. Light and dark mode different colors using two color definitions
+1. Light and dark mode different colors using a color filter
+
+### Light and dark mode the same color
+
+::::{note}
+This method has the benefit that the custom color can be used also within html and css elements.
+::::
+
+#### Code in `_static/color.css` 
+
+```css
+:root {
+    --newcolor: rgb(111, 29, 119);
+}
+
+.newcolor {color: var(--newcolor);}
+```
+
+#### Code in content
+
+```latex
+:::{math}
+\class{newcolor}{\LaTeX}
+:::
+```
+
+```html
+<div class="newcolor">HTML text</div>
+```
+
+#### Result
+
+:::{math}
+\class{newcolor-same}{\LaTeX}
+:::
+
+<div class="newcolor-same">HTML text</div>
+
+### Light and dark mode different colors using two color definitions
+
+::::{note}
+This method has the benefit that the custom colors can be used also within html and css elements with automatic changes when the mode changes from Light to dark or vice versa. 
+::::
+
+
+#### Code in `_static/color.css` 
+
+```css
+:root {
+    --newcolor: rgb(111, 29, 119);
+}
+
+html[data-theme="dark"] {
+    --newcolor: rgb(255, 167, 255)
+}
+
+.newcolor {color: var(--newcolor);}
+```
+
+#### Code in content
+
+```latex
+:::{math}
+\class{newcolor}{\LaTeX}
+:::
+```
+
+```html
+<div class="newcolor">HTML text</div>
+```
+
+#### Result
+
+:::{math}
+\class{newcolor}{\LaTeX}
+:::
+
+<div class="newcolor">HTML text</div>
+
+### Light and dark mode different colors using a color filter
+
+::::{warning}
+This method has the drawback that the custom colors can only be used as a class.
+::::
+
+#### Code in `_static/color.css` 
+
+```css
+:root {
+    --newcolor: rgb(111, 29, 119);
+}
+
+.newcolor {color: var(--newcolor);}
+
+html[data-theme="dark"] .newcolor {
+  filter:  invert(1) hue-rotate(180deg) saturate(1.5);
+}
+
+```
+
+#### Code in content
+
+```latex
+:::{math}
+\class{newcolor}{\LaTeX}
+:::
+```
+
+```html
+<div class="newcolor">HTML text</div>
+```
+
+#### Result
+
+:::{math}
+\class{newcolor-filter}{\LaTeX}
+:::
+
+<div class="newcolor-filter">HTML text</div>