diff --git a/app/views/users/registrations/success.html.erb b/app/views/users/registrations/success.html.erb
index fa6102769..a7b1066ca 100644
--- a/app/views/users/registrations/success.html.erb
+++ b/app/views/users/registrations/success.html.erb
@@ -4,5 +4,5 @@
 <p><%= t("devise_views.users.registrations.success.instructions_2_html") %></p>
 <p>
   <%= link_to t("devise_views.users.registrations.success.back_to_index"),
-      root_path, class: "button radius small margin-top" %>
+      root_path, class: "button radius small margin-top expand" %>
 </p>