diff --git a/navigation-menu.tsx b/navigation-menu.tsx
index 186c6de..8e6a44d 100644
--- a/navigation-menu.tsx
+++ b/navigation-menu.tsx
@@ -6,15 +6,17 @@ import { cn } from "./cn";
 
 const NavigationMenu = forwardRef<
   ElementRef<typeof NavigationMenuPrimitive.Root>,
-  ComponentPropsWithoutRef<typeof NavigationMenuPrimitive.Root>
->(({ className, children, ...props }, ref) => (
+  ComponentPropsWithoutRef<typeof NavigationMenuPrimitive.Root> & {
+    viewPortClassName?: string;
+  }
+>(({ className, children, viewPortClassName, ...props }, ref) => (
   <NavigationMenuPrimitive.Root
     ref={ref}
     className={cn("relative z-10 flex max-w-max flex-1 items-center justify-center", className)}
     {...props}
   >
     {children}
-    <NavigationMenuViewport />
+    <NavigationMenuViewport className={viewPortClassName} />
   </NavigationMenuPrimitive.Root>
 ));
 
@@ -71,7 +73,7 @@ const NavigationMenuViewport = forwardRef<
   <div className={cn("absolute top-full left-0 flex justify-center")}>
     <NavigationMenuPrimitive.Viewport
       className={cn(
-        "data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-90 relative mt-1.5 h-[var(--radix-navigation-menu-viewport-height)] w-full origin-top-center overflow-hidden rounded-md border bg-popover text-popover-foreground shadow data-[state=closed]:animate-out data-[state=open]:animate-in md:w-[var(--radix-navigation-menu-viewport-width)]",
+        "data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-90 relative mt-1.5 h-[var(--radix-navigation-menu-viewport-height)] w-full origin-top-center overflow-hidden rounded-md border bg-popover text-popover-foreground data-[state=closed]:animate-out data-[state=open]:animate-in md:w-[var(--radix-navigation-menu-viewport-width)]",
         className,
       )}
       ref={ref}
diff --git a/package.json b/package.json
index caebced..2bf8bc6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@risc0/ui",
-  "version": "0.0.154",
+  "version": "0.0.155",
   "private": false,
   "sideEffects": false,
   "type": "module",
@@ -37,7 +37,7 @@
     "clsx": "2.1.1",
     "cmdk": "1.0.0",
     "lucide-react": "0.428.0",
-    "next": "15.0.0-canary.118",
+    "next": "15.0.0-canary.120",
     "next-themes": "0.3.0",
     "radash": "12.1.0",
     "react-hook-form": "7.52.2",
@@ -48,7 +48,7 @@
     "tailwind-merge": "2.5.2",
     "tailwindcss": "3.4.10",
     "tailwindcss-animate": "1.0.7",
-    "typescript": "5.6.0-dev.20240816",
+    "typescript": "5.6.0-dev.20240819",
     "vaul": "0.9.1"
   },
   "devDependencies": {