diff --git a/frontend/components/StackModal.tsx b/frontend/components/StackModal.tsx
index e8a18c4..4053d21 100644
--- a/frontend/components/StackModal.tsx
+++ b/frontend/components/StackModal.tsx
@@ -38,7 +38,7 @@ export const StackModal: React.FC<{ isOpen: boolean; onClose: () => void; root:
   const canBack = stack.length > 1;
 
   return (
-    <div className={`fixed inset-0 bg-black/40 z-[70] flex items-end sm:items-center justify-center ${fullscreen ? '' : 'sm:p-4'}`}>
+    <div className={`fixed inset-0 bg-black/0 z-[70] flex items-end sm:items-center justify-center ${fullscreen ? '' : 'sm:p-4'}`}>
       <div
         className={`bg-white shadow-2xl flex flex-col overflow-hidden transition-all duration-300 w-full ${
           fullscreen