diff --git a/layouts/index.html b/layouts/index.html
index 934fc46..899c258 100644
--- a/layouts/index.html
+++ b/layouts/index.html
@@ -3,6 +3,8 @@
 <head>
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
+{{/* Dark Reader repaints pages that already draw their own dark theme, as this one does: ask it to stand aside. */}}
+<meta name="darkreader-lock">
 <title>{{ .Site.Title }} — a Ruby front-end in pure Go: lexer, parser, AST, no cgo</title>
 <meta name="description" content="go-ruby-parser — a pure-Go (CGO=0) Ruby front-end: a stateful lexer, a recursive-descent + Pratt parser, and a typed AST for building Ruby tooling in Go without cgo or Prism.">
 <style>