Added margin between form and button in resend-confirmation form.

app/views/devise/confirmations/new.html.haml

@@ -3,6 +3,7 @@
   = form_for(resource, as: resource_name, url: confirmation_path(resource_name), html: { method: :post }) do |f|
     .devise-errors
       = devise_error_messages!
+    .clearfix.append-bottom-20
       = f.email_field :email, placeholder: 'Email', class: "form-control", required: true
     .clearfix.append-bottom-10
       = f.submit "Resend confirmation instructions", class: 'btn btn-success'