adjust email templates

app/views/submit_form/completed.html.erb

@@ -1,4 +1,4 @@
-<div class="max-w-md mx-auto px-2 mt-12">
+<div class="max-w-md mx-auto px-2 mt-12 mb-4">
   <div class="space-y-6 mx-auto">
     <div class="space-y-6">
       <div class="flex items-center justify-center">
@@ -42,3 +42,4 @@
     </div>
   </div>
 </div>
+<%= render 'shared/attribution' %>