diff --git a/episodes/exercise.md b/episodes/exercise.md
index 40f76d8..f425db2 100644
--- a/episodes/exercise.md
+++ b/episodes/exercise.md
@@ -82,13 +82,15 @@ That's it! Using those four key steps, we have learned the basics of computation
 
 ---------
 
-:::challenge
+::::::::::::::::::::::::::::::::: challenge
+
 ## Practice
 
 Use the algorithm above to add up all the numbers between 1 and 24, 1 and 50, and 1 and 1,000.
-:::
 
-:::: discussion
+::::::::::::::
+
+::::::::::::::::::::::::::::::::: discussion
 
 ## Discussion