not sure but it seems to work

pages/prices.tsx

@@ -1,6 +1,8 @@
+import Layout from '../components/layout'
+
 export default function Prices() {
   return (
-    <>
+    <Layout>
       <h1 className="mb-3 text-xl font-extrabold">Preise</h1>
       <table className="divide-y divide-gray-200">
         <thead className="bg-gray-50">
@@ -50,6 +52,6 @@ export default function Prices() {
           </tr>
         </tbody>
       </table>
-    </>
+    </Layout>
   )
-}
+}