diff --git a/app/views/devise/shared/_links.haml b/app/views/devise/shared/_links.haml
index c8a6c041..b4b89175 100644
--- a/app/views/devise/shared/_links.haml
+++ b/app/views/devise/shared/_links.haml
@@ -3,7 +3,8 @@
 - locale = params.permit(:locale)
 
 - if controller_name != 'sessions'
-  = link_to t('.sign_in'), new_session_path(resource_name, params: locale)
+  = link_to t('.sign_in'), new_session_path(resource_name, params: locale),
+    class: 'btn btn-lg btn-block btn-success'
   %br/
 
 - if devise_mapping.registerable? && controller_name != 'registrations'