diff --git a/src/components/collapse/index.css b/src/components/collapse/index.css
index 369f7d4..7627b77 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-default);
+    border-bottom: 1px solid var(--bim-border-strong);
 }
 
 .bim-collapse.is-ghost .bim-collapse-header:hover {
diff --git a/src/components/collapse/index.ts b/src/components/collapse/index.ts
index c515aad..8e6012b 100644
--- a/src/components/collapse/index.ts
+++ b/src/components/collapse/index.ts
@@ -216,6 +216,7 @@ export class BimCollapse implements IBimComponent {
         style.setProperty('--bim-bg-elevated', theme.bgElevated);
         style.setProperty('--bim-border-default', theme.borderDefault);
         style.setProperty('--bim-border-subtle', theme.borderSubtle);
+        style.setProperty('--bim-border-strong', theme.borderStrong);
         style.setProperty('--bim-text-primary', theme.textPrimary);
         style.setProperty('--bim-text-disabled', theme.textDisabled);
         style.setProperty('--bim-component-bg', theme.componentBg);