diff --git a/css/leptonContentESR.css b/css/leptonContentESR.css
index fd77d24..5cad91c 100644
--- a/css/leptonContentESR.css
+++ b/css/leptonContentESR.css
@@ -85,7 +85,7 @@
 @supports -moz-bool-pref("userContent.player.ui") {
   audio {
     --duration-color: #929292; /* Like Original */
-    --media-background: rgba(26, 26, 26, 0.8); /* Like Original */
+    background: rgba(26, 26, 26, 0.8); /* Like Original */
     border-radius: 8px;
     --box-shadow1: rgba(14, 13, 26, 0.12);
     --box-shadow2: rgba(7, 48, 114, 0.12);