diff --git a/theme-github-auto.css b/theme-github-auto.css
index 36df307..889c672 100644
--- a/theme-github-auto.css
+++ b/theme-github-auto.css
@@ -425,6 +425,7 @@
     --is-dark-theme: true;
     --color-blue: #539bf5;
     --color-input-background: #22272e;
+    --color-header-bar: #373e47;
 
     /* code editor colors are set in https://github.com/go-gitea/gitea/blob/f5b300ea77081a1b78ac044cb1c0f9225538d091/web_src/js/features/codeeditor.js#L82-L97.  */
     /* monaco editor dark theme is toggled via variable `--is-dark-theme` */