[feat] about page layout finished

app/(root)/loading.js

@@ -0,0 +1,7 @@
+export default function Loading() {
+  return (
+    <div className="flex justify-center items-center h-screen w-screen bg-gray-900">
+      <h1 className="text-4xl text-gray-100">Loading...</h1>
+    </div>
+  )
+}