git init

resources/js/components/ui/navigation-menu/NavigationMenuViewport.vue

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+<script setup lang="ts">
+import type { NavigationMenuViewportProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import {
+  NavigationMenuViewport,
+  useForwardProps,
+} from "reka-ui"
+import { cn } from "@/lib/utils"
+
+const props = defineProps<NavigationMenuViewportProps & { class?: HTMLAttributes["class"] }>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwardedProps = useForwardProps(delegatedProps)
+</script>
+
+<template>
+  <div class="absolute top-full left-0 isolate z-50 flex justify-center">
+    <NavigationMenuViewport
+      data-slot="navigation-menu-viewport"
+      v-bind="forwardedProps"
+      :class="
+        cn(
+          'origin-top-center bg-popover text-popover-foreground data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-90 relative mt-1.5 h-[var(--reka-navigation-menu-viewport-height)] w-full overflow-hidden rounded-md border shadow md:w-[var(--reka-navigation-menu-viewport-width)] left-[var(--reka-navigation-menu-viewport-left)]',
+          props.class,
+        )
+      "
+    />
+  </div>
+</template>