add modal to show code

packages/website/app/modules/dom/portal.tsx

@@ -0,0 +1,20 @@
+import type { ReactNode } from "react"
+import { useEffect, useRef } from "react"
+import { createPortal } from "react-dom"
+
+export function Portal({ children }: { children: ReactNode }) {
+  const containerRef = useRef<Element>()
+
+  if (!containerRef.current && typeof document !== "undefined") {
+    containerRef.current = document.createElement("react-portal")
+    document.body.append(containerRef.current)
+  }
+
+  useEffect(() => () => containerRef.current!.remove(), [])
+
+  return containerRef.current ? (
+    createPortal(children, containerRef.current)
+  ) : (
+    <>{children}</>
+  )
+}