diff -Naur 7.x-3.x-dev/timeline.theme.inc fixed/timeline.theme.inc
--- 7.x-3.x-dev/timeline.theme.inc	2012-11-21 19:18:24.000000000 +0000
+++ fixed/timeline.theme.inc	2016-04-06 12:34:38.887752013 +0100
@@ -134,7 +134,7 @@
           }
         }
 
-        drupal_add_css('timeline', 'timeline');
+        drupal_add_css(drupal_get_path('module', 'timeline') . '/css/timeline.css');
         drupal_add_js(drupal_get_path('module', 'timeline') . '/js/timeline.js', array('weight' => 13));
         $loaded = TRUE;