diff --git a/M02_MasterTemplete/M02_MasterTemplete_DetailNav.ts b/M02_MasterTemplete/M02_MasterTemplete_DetailNav.ts
index ecf8d49b0..3dd81ee7d 100644
--- a/M02_MasterTemplete/M02_MasterTemplete_DetailNav.ts
+++ b/M02_MasterTemplete/M02_MasterTemplete_DetailNav.ts
@@ -32,7 +32,7 @@ export interface DetailNav {
 
 export function createDetailNav(go: (kind: DetailKind) => void): DetailNav {
   const buttons = ITEMS.map(([kind, label]) => {
-    const button = createButton({ label, size: "sm", onClick: () => go(kind) });
+    const button = createButton({ label, size: "sm", variant: "ghost", onClick: () => go(kind) });
     button.dataset.detailNav = kind;
     return button;
   });