diff --git a/ion-theme.css b/ion-theme.css
index 51e03c2..1fff4cc 100644
--- a/ion-theme.css
+++ b/ion-theme.css
@@ -221,3 +221,8 @@
 [class*="spoilerMarkdownContent"]:hover {
     background-color: rgba(37, 0, 85, 1);
 }
+
+/* sidebar */
+.custom-theme-background .scroller_fea3ef {
+    background: transparent !important;
+}