diff --git a/src/app/components/ThreadList.tsx b/src/app/components/ThreadList.tsx
index 44b8495..6915183 100644
--- a/src/app/components/ThreadList.tsx
+++ b/src/app/components/ThreadList.tsx
@@ -66,7 +66,7 @@ const GROUP_LABELS = {
 } as const;
 
 const STATUS_COLORS: Record<ThreadItem["status"], string> = {
-  idle: "bg-green-500",
+  idle: "bg-transparent ring-1 ring-inset ring-green-500",
   busy: "bg-blue-500",
   interrupted: "bg-orange-500",
   error: "bg-red-600",