diff --git a/book/syntax_exercises/013.md b/book/syntax_exercises/013.md
index 62db026..39829c5 100644
--- a/book/syntax_exercises/013.md
+++ b/book/syntax_exercises/013.md
@@ -45,8 +45,8 @@ You can generate BibTeX entries using free tools like [ZoteroBib](https://zbib.o
 * `{cite:ps}`
 * `{cite:ts}`
 
-```{dropdown} Hint: What to expect when you render these
-:class: hint
+```{hint} What to expect when you render these
+:class: dropdown
 
 Here’s how the citation will appear for the example in the shared bibliography:
 
@@ -107,8 +107,8 @@ sphinx:
 * `super`
 * `number`
 
-```{dropdown} Hint: What each reference style will look like
-:class: hint
+```{hint} What each reference style will look like
+:class: dropdown
 
 Heres's how each style will appear for the example in the shared bibliography:
 
@@ -137,8 +137,8 @@ Feeling brave? You can also use APA references, although this is not a default o
 - `unsrt`
 - `unsrtalpha`
 
-```{dropdown} Hint: What each bibliography style looks like
-:class: hint
+```{hint} What each bibliography style looks like
+:class: dropdown
 
 Heres's how each style will appear for the example in the shared bibliography: