diff --git a/themes/tiddlywiki/snowwhite/base.tid b/themes/tiddlywiki/snowwhite/base.tid
index 3681fd69c..d79a56c64 100644
--- a/themes/tiddlywiki/snowwhite/base.tid
+++ b/themes/tiddlywiki/snowwhite/base.tid
@@ -139,9 +139,9 @@ table tfoot tr td {
 	max-width: 100%;
 }
 
-embed {
-	max-width: 100%;
-	max-height: 280px;
+.tw-tiddler-frame embed {
+	width: 100%;
+	height: 600px;
 }
 
 /*