diff --git a/packages/web/src/javascripts/Components/SuperEditor/Plugins/CollapsiblePlugin/Collapsible.css b/packages/web/src/javascripts/Components/SuperEditor/Plugins/CollapsiblePlugin/Collapsible.css
index e7b3742e4..c0e885281 100644
--- a/packages/web/src/javascripts/Components/SuperEditor/Plugins/CollapsiblePlugin/Collapsible.css
+++ b/packages/web/src/javascripts/Components/SuperEditor/Plugins/CollapsiblePlugin/Collapsible.css
@@ -41,7 +41,7 @@
   transform: translateY(-50%);
 }
 
-.Collapsible__container[open] .Collapsible__title:before {
+.Collapsible__container[open] > .Collapsible__title:before {
   border-color: transparent;
   border-width: 6px 4px 0 4px;
   border-top-color: var(--sn-stylekit-contrast-color);