diff --git a/styles.css b/styles.css
index 60b6bac1e2e2f4bf452f5f1e9d169bbdf948a36e..e87c3663078d8ad7e0b4b1aa13f8a6f5a4a938f5 100644
--- a/styles.css
+++ b/styles.css
@@ -472,6 +472,7 @@ body {
 
 .path-mod-pdfannotator .chat-message button, .path-mod-pdfannotator #comment-nav button {
     border-color: transparent;
+    background-color: transparent;
 }
 
 .path-mod-pdfannotator .chat-message.questioncomment {