diff --git a/.gitignore b/.gitignore
index d87d4be..609d804 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,4 @@ spec/reports
 test/tmp
 test/version_tmp
 tmp
+.sass-cache/
diff --git a/lib/assets/stylesheets/separate_html5_date_and_time/active_admin.css.scss b/lib/assets/stylesheets/separate_html5_date_and_time/active_admin.css.scss
new file mode 100644
index 0000000..4fda3aa
--- /dev/null
+++ b/lib/assets/stylesheets/separate_html5_date_and_time/active_admin.css.scss
@@ -0,0 +1,5 @@
+.separate_date_and_time_picker {
+  .input-date {
+    width: 20% !important;
+  }
+}
diff --git a/lib/formtastic-separate_html5_date_and_time.rb b/lib/formtastic-separate_html5_date_and_time.rb
index ef5c258..ce9f84c 100644
--- a/lib/formtastic-separate_html5_date_and_time.rb
+++ b/lib/formtastic-separate_html5_date_and_time.rb
@@ -2,7 +2,7 @@ require "formtastic-separate_html5_date_and_time/version"
 
 module Formtastic
   module SeparateHtml5DateAndTime
-    class Railtie < ::Rails::Railtie
+    class Engine < ::Rails::Engine
       initializer 'separate_html5_date_and_time.initialize' do
         require 'formtastic'
         require 'formtastic-separate_html5_date_and_time/formtastic'