Compensate for scrollbar disappearing when media modal visible (#8100)

* Compensate for scrollbar disappearing when media modal visible

Make auth pages backgrounds lighter

* Fix typo

app/controllers/auth/passwords_controller.rb

@@ -2,6 +2,7 @@
 
 class Auth::PasswordsController < Devise::PasswordsController
   before_action :check_validity_of_reset_password_token, only: :edit
+  before_action :set_body_classes
 
   layout 'auth'
 
@@ -14,6 +15,10 @@ class Auth::PasswordsController < Devise::PasswordsController
     end
   end
 
+  def set_body_classes
+    @body_classes = 'lighter'
+  end
+
   def reset_password_token_is_valid?
     resource_class.with_reset_password_token(params[:reset_password_token]).present?
   end