diff --git a/index.html b/index.html
index ee470f12..207d6dcc 100644
--- a/index.html
+++ b/index.html
@@ -9,6 +9,11 @@
     <link rel="icon" type="image/png" sizes="96x96" href="/favicon-96x96.png?v=__ICON_VERSION__" />
     <link rel="icon" type="image/png" sizes="192x192" href="/favicon-192x192.png?v=__ICON_VERSION__" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <!-- Keeps the Dark Reader extension off the page, which has dark palettes
+         of its own: it rewrites the stylesheet's colors, and its rewrite of
+         the fallback the build gives every light-dark() leaves them all
+         invalid under a dark system theme, so no background is painted. -->
+    <meta name="darkreader-lock" />
     <meta name="theme-color" media="(prefers-color-scheme: dark)" content="#01152a" />
     <meta name="theme-color" media="(prefers-color-scheme: light)" content="#faf5e9" />
     <meta name="site-name" content="__SITE_NAME__" />