diff --git a/chrome/content/zotero-platform/mac/overlay.css b/chrome/content/zotero-platform/mac/overlay.css
index dcf0418343..0553db9230 100644
--- a/chrome/content/zotero-platform/mac/overlay.css
+++ b/chrome/content/zotero-platform/mac/overlay.css
@@ -225,7 +225,8 @@ input {
 	margin-inline-end: -4px;
 	width: 5px !important;
 	min-width: 5px;
-	position: relative;
+	/* Create a separate stacking context to be on top */
+	opacity: 0.99;
 	background-image: none;
 }