fix: add custom class to the signup popup

Author: yaroslav8765

custom/SignupPage.vue

@@ -27,7 +27,7 @@
       overflow-x-hidden z-50 min-w-[350px]  justify-center items-center md:inset-0 h-[calc(100%-1rem)] max-h-full">
         <div class="relative p-4 w-full max-h-full max-w-[400px]">
             <!-- Modal content -->
-            <div class="relative bg-white rounded-lg shadow dark:bg-gray-700 dark:shadow-black" >
+            <div class="af-login-popup relative bg-white rounded-lg shadow dark:bg-gray-700 dark:shadow-black" >
                 <!-- Modal header -->
                 <div class="flex items-center justify-between p-4 md:p-5 border-b rounded-t dark:border-gray-600">
                     <h3 class="text-xl font-semibold text-gray-900 dark:text-white">