diff --git a/book/basic-features/utterances.md b/book/basic-features/utterances.md
index 9ec87f1..5bd350b 100644
--- a/book/basic-features/utterances.md
+++ b/book/basic-features/utterances.md
@@ -1,6 +1,6 @@
 # Discussions in your book: Utterances
 
-{bdg-muted}`Javascript script`
+{bdg-white}`GitHub app and Javascript script`
 
 [Utterances 🔮](https://utteranc.es/) is a lightweight open-source widget which allows you, your colleages and your students to discuss stuff in a blog post in your book. It is build on GitHub issues, so requires a GitHub repository, although the book can be hosted anywhere (so also on GitLab).
 
diff --git a/book/features/HTML_javascript.md b/book/features/HTML_javascript.md
index 4192375..f103638 100644
--- a/book/features/HTML_javascript.md
+++ b/book/features/HTML_javascript.md
@@ -5,7 +5,7 @@
 This section is useful for user type 5.
 ```
 
-{bdg-info}`iframe`
+{bdg-danger}`iframe`
 
 In this section, we will discuss how to [create](creating_basic_HTML_elements.md) and [embed](adding_HTML_elements.md) interactive HTML/Javascript elements created in HTML/JavaScript in a TeachBook. These HTML/Javascript element work very fluently and don't require a python kernel running in the background.
 
diff --git a/book/features/adding_HTML_elements.md b/book/features/adding_HTML_elements.md
index deab9f0..b241964 100644
--- a/book/features/adding_HTML_elements.md
+++ b/book/features/adding_HTML_elements.md
@@ -1,6 +1,6 @@
 # Adding interactive HTML/JavaScript elements
 
-{bdg-info}`iframe`
+{bdg-danger}`iframe`
 
 In this section, we will discuss how to embed interactive elements created in HTML/JavaScript in a TeachBook. If you are interested in learning how to create these elements yourself, we will discuss an example in the [next article](creating_basic_HTML_elements.md). As an example, let us discuss how to embed an interactive 3D model of a subsurface environment I created:
 
diff --git a/book/features/overview.md b/book/features/overview.md
index de7ea78..30d40b8 100644
--- a/book/features/overview.md
+++ b/book/features/overview.md
@@ -7,12 +7,12 @@ Since the list of TeachBook features is getting quite long, we have grouped them
 Additionally, not all features are built using the same type of sourcecode. For transparency, tags will help differentiate between the different backgrounds of the features:
 - {bdg-warning}`Javascript overlay`
 - {bdg-success}`Chrome Extension`
-- {bdg-muted}`GitHub App and Javascript script`
+- {bdg-white}`GitHub App and Javascript script`
 - {bdg-secondary}`Python Package`
 - {bdg-light}`GitHub Reusable Action`
 - {bdg-dark}`Git Workflow`
 - {bdg-primary}`Sphinx Extension`
-- {bdg-info}`iframe`
+- {bdg-danger}`iframe`
 
 Finally, the purpose, installation process and usage of each features is elaborated on in the respective sub-sections.