diff --git a/src/components/collapse/index.css b/src/components/collapse/index.css
index a3c5537..369f7d4 100644
--- a/src/components/collapse/index.css
+++ b/src/components/collapse/index.css
@@ -19,7 +19,7 @@
     background-color: var(--bim-component-bg);
     padding-left: 12px;
     padding-right: 0;
-    border-bottom: 1px solid var(--bim-border-subtle);
+    border-bottom: 1px solid var(--bim-border-default);
 }
 
 .bim-collapse.is-ghost .bim-collapse-header:hover {