diff --git a/Mac/MainWindow/Detail/styleSheet.css b/Mac/MainWindow/Detail/styleSheet.css
index e1e6f7f44..6cbf20640 100644
--- a/Mac/MainWindow/Detail/styleSheet.css
+++ b/Mac/MainWindow/Detail/styleSheet.css
@@ -122,7 +122,7 @@ code, pre {
 pre  {
 	white-space: pre-wrap;
 }
-img, figure, video {
+img, figure, video, iframe {
 	max-width: 100%;
 	height: auto;
 	margin: 0 auto;