Create placeholder content

src/components/demo/placeholder-content.tsx

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+import Link from "next/link";
+import Image from "next/image";
+
+import { Card, CardContent } from "@/components/ui/card";
+
+export default function PlaceholderContent() {
+  return (
+    <Card className="rounded-lg border-none mt-6">
+      <CardContent className="p-6">
+        <div className="flex justify-center items-center min-h-[calc(100vh-56px-64px-20px-24px-56px-48px)]">
+          <div className="flex flex-col relative">
+            <Image
+              src="/placeholder.png"
+              alt="Placeholder Image"
+              width={500}
+              height={500}
+              priority
+            />
+            <div className="absolute -bottom-8 right-0">
+              <Link
+                href="https://www.freepik.com"
+                target="_blank"
+                rel="noopener noreferrer"
+                className="text-xs text-muted-foreground"
+              >
+                Designed by Freepik
+              </Link>
+            </div>
+          </div>
+        </div>
+      </CardContent>
+    </Card>
+  );
+}

src/components/ui/card.tsx

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+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+const Card = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div
+    ref={ref}
+    className={cn(
+      "rounded-xl border bg-card text-card-foreground shadow",
+      className
+    )}
+    {...props}
+  />
+))
+Card.displayName = "Card"
+
+const CardHeader = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div
+    ref={ref}
+    className={cn("flex flex-col space-y-1.5 p-6", className)}
+    {...props}
+  />
+))
+CardHeader.displayName = "CardHeader"
+
+const CardTitle = React.forwardRef<
+  HTMLParagraphElement,
+  React.HTMLAttributes<HTMLHeadingElement>
+>(({ className, ...props }, ref) => (
+  <h3
+    ref={ref}
+    className={cn("font-semibold leading-none tracking-tight", className)}
+    {...props}
+  />
+))
+CardTitle.displayName = "CardTitle"
+
+const CardDescription = React.forwardRef<
+  HTMLParagraphElement,
+  React.HTMLAttributes<HTMLParagraphElement>
+>(({ className, ...props }, ref) => (
+  <p
+    ref={ref}
+    className={cn("text-sm text-muted-foreground", className)}
+    {...props}
+  />
+))
+CardDescription.displayName = "CardDescription"
+
+const CardContent = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div ref={ref} className={cn("p-6 pt-0", className)} {...props} />
+))
+CardContent.displayName = "CardContent"
+
+const CardFooter = React.forwardRef<
+  HTMLDivElement,
+  React.HTMLAttributes<HTMLDivElement>
+>(({ className, ...props }, ref) => (
+  <div
+    ref={ref}
+    className={cn("flex items-center p-6 pt-0", className)}
+    {...props}
+  />
+))
+CardFooter.displayName = "CardFooter"
+
+export { Card, CardHeader, CardFooter, CardTitle, CardDescription, CardContent }