diff --git a/plugins/tiddlywiki/upgrade/styles.tid b/plugins/tiddlywiki/upgrade/styles.tid
index f6b69c867..4420798f9 100644
--- a/plugins/tiddlywiki/upgrade/styles.tid
+++ b/plugins/tiddlywiki/upgrade/styles.tid
@@ -14,6 +14,7 @@ tags: $:/tags/stylesheet
 	position: relative;
 	border: 1px solid #ddd;
 	<<box-shadow "inset 1px 2px 4px rgba(0, 0, 0, 0.15)">>;
+	overflow: hidden;
 }
 
 .tw-upgrade-wizard svg.tw-image-download-button {