diff --git a/video_embed_field.handlers.inc b/video_embed_field.handlers.inc
index 62af43a..5d24d2c 100644
--- a/video_embed_field.handlers.inc
+++ b/video_embed_field.handlers.inc
@@ -184,7 +184,7 @@ function video_embed_field_handle_youtube($url, $settings) {
   $settings['wmode'] = 'opaque';
   $settings_str = _video_embed_code_get_settings_str($settings);
 
-  $output['#markup'] = '<iframe width="' . check_plain($settings['width']) . '" height="' . check_plain($settings['height']) . '" src="//www.youtube.com/embed/' . $id . '?' . $settings_str . '" frameborder="0" allowfullscreen></iframe>';
+  $output['#markup'] = '<iframe class="video-fluidvids" width="' . check_plain($settings['width']) . '" height="' . check_plain($settings['height']) . '" src="//www.youtube.com/embed/' . $id . '?' . $settings_str . '" frameborder="0" allowfullscreen></iframe>';
 
   return $output;
 }