diff --git a/web/debugger.css b/web/debugger.css
index ba24ad6a06b16..b9d9f8190686e 100644
--- a/web/debugger.css
+++ b/web/debugger.css
@@ -50,7 +50,7 @@
 }
 .debuggerShowText,
 .debuggerHideText:hover {
-  background-color: rgb(255 255 0);
+  background-color: rgb(255 255 0 / 0.25);
 }
 #PDFBug .stats {
   font-family: courier;