diff --git a/.gitignore b/.gitignore
index 79239dd972..73b7ad4c67 100644
--- a/.gitignore
+++ b/.gitignore
@@ -58,3 +58,5 @@ vendor/gobierto_engines/*
 !vendor/gobierto_engines/.keep
 app/javascript/gencat
 app/javascript/packs/gencat.js
+app/javascript/valencia
+app/javascript/packs/valencia.js
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index f2b7233e39..1967c2429d 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -4,6 +4,9 @@ module ApplicationHelper
 
   def body_css_classes
     classes = []
+    if current_site&.configuration&.engine_overrides&.any?
+      classes.push(Rails.configuration.gobierto_engines_themes[current_site.configuration.engine_overrides.first])
+    end
     classes.push current_module == "gobierto_participation" ? "gobierto_participation theme-participation" : current_module
     classes.push controller_name
     classes.push action_name
diff --git a/config/application.rb b/config/application.rb
index a35bb92df0..30166ce4f8 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -54,20 +54,21 @@ class Application < Rails::Application
     # Auth Strategies
     base_strategies_path = %w(vendor auth_strategies)
     available_strategies = Dir.chdir(config.root.join(*base_strategies_path)) do
-      Dir.glob('*').select{ |file| File.directory?(file) }
+      Dir.glob("*").select { |file| File.directory?(file) }
     end
 
     available_strategies.each do |strategy|
-      require_dependency config.root.join(*base_strategies_path).join(strategy, 'lib', 'initializer')
+      require_dependency config.root.join(*base_strategies_path).join(strategy, "lib", "initializer")
     end
 
     # Engine Overrides
     config.engine_sass_config_overrides = []
     config.engine_sass_theme_dependencies = []
+    config.gobierto_engines_themes = {}
 
     base_engines_path = %w(vendor gobierto_engines)
     available_engines = Dir.chdir(config.root.join(*base_engines_path)) do
-      Dir.glob('*').select { |item| File.directory?(item) }
+      Dir.glob("*").select { |item| File.directory?(item) }
     end
 
     available_engines.each do |engine_dir|