diff --git a/core/static/core/accordion.scss b/core/static/core/accordion.scss
index 07793a7a..abdbba02 100644
--- a/core/static/core/accordion.scss
+++ b/core/static/core/accordion.scss
@@ -33,7 +33,7 @@ details.accordion>summary::before {
   font-size: 0.8em;
 }
 
-details[open]>summary::before {
+details[open].accordion>summary::before {
   font-family: FontAwesome;
   content: '\f0d7';
 }