diff --git adaptive_image.module adaptive_image.module
index a3c4b5a..0f7b5c9 100644
--- adaptive_image.module
+++ adaptive_image.module
@@ -181,6 +181,8 @@ function adaptive_image_preprocess_image(&$variables) {
       // Remove fixed image dimensions
       unset($variables['height']);
       unset($variables['width']);
+
+      drupal_add_css(drupal_get_path('module', 'adaptive_image') . '/css/adaptive-image.css');
     }
   }
 }