diff --git a/assets/layout.html b/assets/layout.html
index 656673f..db8ef09 100644
--- a/assets/layout.html
+++ b/assets/layout.html
@@ -3,6 +3,10 @@
     <head>
         <meta charset="UTF-8" />
         <meta name="viewport" content="width=device-width, initial-scale=1, interactive-widget=resizes-content" />
+        <!-- Dark from the first frame: browsers without cross-document view
+             transitions (Firefox) otherwise flash their default white canvas
+             between pages, before style.css applies. -->
+        <meta name="color-scheme" content="dark" />
         <title>{{.Title}}</title>
         <link rel="icon" href="{{asset "favicon.ico"}}" />
         <link rel="preload" href="/_/fonts/IosevkaEtoile.woff2" as="font" type="font/woff2" crossorigin />