diff --git a/session_4/session_4.Rmd b/session_4/session_4.Rmd
index 87b4416c9c6d7b5208ece987642c4a170a555332..26b3fb7292c30a459798863104148846b864b879 100644
--- a/session_4/session_4.Rmd
+++ b/session_4/session_4.Rmd
@@ -381,9 +381,9 @@ flights_sml <- mutate(flights_sml,
   gain = dep_delay - arr_delay,
   speed = distance / air_time * 60
 )
-```
-</details>
+``` 
 </p>
+</details>
 
 
 <div class="pencadre">