fix register bug

public/register/app.js

@@ -46,6 +46,8 @@ document.getElementById('registerForm').addEventListener('submit', function (e)
         method: 'POST',
         headers: {
             'Content-Type': 'application/json'
+    },
+        body: JSON.stringify(data)
     })
     .then(async response => {
         const responseData = await response.json().catch(() => ({}));

public/register/index.html

@@ -17,7 +17,7 @@
 
     <!-- === MODAL DE REGISTRO === -->
     <div id="registerModal"
-         class="inset-0 bg-black/70 flex items-center justify-center z-50 p-4">
+         class="fixed inset-0 bg-black/70 flex items-center justify-center z-50 p-4">
       <form id="registerForm" class="bg-white w-full max-w-md p-8 rounded-xl shadow-xl space-y-6">
         <div class="text-center">
           <h2 class="text-2xl font-bold text-gray-900">¡Regístrate!</h2>