diff --git a/book/exercises/001.md b/book/exercises/001.md
index 40c937a..9eb1489 100644
--- a/book/exercises/001.md
+++ b/book/exercises/001.md
@@ -31,13 +31,11 @@ Before moving on to the next exercise, make sure you understand the following:
 - How can you view the changes you made to the book?
 - What is the purpose of a commit message and description?
 ```
-:::{exercise}
-:nonumber: true
+:::{card} Check your understanding
 <iframe src="https://tudelft.h5p.com/content/1292493444533374767/embed" aria-label="Test your Teachbooks knowledge" width="1088" height="637" frameborder="0" allowfullscreen="allowfullscreen" allow="autoplay *; geolocation *; microphone *; camera *; midi *; encrypted-media *"></iframe><script src="https://tudelft.h5p.com/js/h5p-resizer.js" charset="UTF-8"></script>
 :::
 
-:::{exercise}
-:nonumber: true
+:::{card} Check your understanding
 <iframe src="https://tudelft.h5p.com/content/1292493455522610637/embed" aria-label="Testing more Teachbooks knowledge" width="1088" height="637" frameborder="0" allowfullscreen="allowfullscreen" allow="autoplay *; geolocation *; microphone *; camera *; midi *; encrypted-media *"></iframe><script src="https://tudelft.h5p.com/js/h5p-resizer.js" charset="UTF-8"></script>
 <style> 
     @media (prefers-color-scheme: light) {
@@ -48,4 +46,4 @@ Before moving on to the next exercise, make sure you understand the following:
         }
     }
 </style>
-:::
+:::
\ No newline at end of file