diff --git a/theme-github-dark.css b/theme-github-dark.css
index e8ef7be..7c1abe2 100755
--- a/theme-github-dark.css
+++ b/theme-github-dark.css
@@ -75,6 +75,7 @@
   --color-primary-light-3: #71798e;
   --color-editor-line-highlight: var(--color-body);
   --color-code-bg: var(--color-body);
+  --color-code-sidebar-bg: var(--color-box-header);
 
   --color-diff-removed-row-bg: rgba(248, 81, 73, 0.15);
   --color-diff-removed-row-border: rgba(248, 81, 73, 0.3);