diff --git a/book/exercises/001.md b/book/exercises/001.md
index 9eb1489..364681a 100644
--- a/book/exercises/001.md
+++ b/book/exercises/001.md
@@ -37,13 +37,4 @@ Before moving on to the next exercise, make sure you understand the following:
 
 :::{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) {
-        iframe[src*="tudelft.h5p.com"] {
-            filter: invert(1); 
-            background: transparent; 
-            mix-blend-mode: difference;
-        }
-    }
-</style>
 :::
\ No newline at end of file