add

superpage/src/pages/[slug].astro

@@ -28,7 +28,7 @@ const { data } = course;
 const { Content } = await render(course);
 ---
 
-<Layout>
+<Layout title={data.title}>
     <Fragment slot="head">
         <title>{data.title} &mdash; EDUSEG&reg;</title>
     </Fragment>

superpage/src/pages/_components/BuyButton.astro

@@ -71,6 +71,7 @@ const currency = new Intl.NumberFormat("pt-BR", {
 
         const r = await checkout(item);
         const json = await r.json();
+        target.disabled = true;
         location.href = `https://checkout.betaeducacao.com.br/${json.id}`;
     });
 </script>