diff --git a/book/intro/book.md b/book/intro/book.md
index 71444b5..d70bfb6 100644
--- a/book/intro/book.md
+++ b/book/intro/book.md
@@ -3,6 +3,7 @@
 Never seen a TeachBook before? Here's a small demo of the MUDE-book!
 
 ```{video} https://www.youtube.com/embed/gbBsWo6em4c?si=ayKhISsx06LmGbDD
+:class: blend
 ```
 
 So what are you looking at? It's a website generated with the [TeachBooks package](https://github.com/TeachBooks/TeachBooks) which in turn makes use of many other tools, of which [Jupyter Book package](https://jupyterbook.org/) and [Sphinx](https://www.sphinx-doc.org/) are the most prominent. Various extensions have been added to improve the student-experience, especially for technical topics! With TeachBooks we aim to make it easy to collaboratively use it, even if you've little experience with the software package which is part of it.