diff --git a/www/assets/css/theme.css b/www/assets/css/theme.css
index 45cf2615..1644de7e 100644
--- a/www/assets/css/theme.css
+++ b/www/assets/css/theme.css
@@ -67,6 +67,12 @@ html {
   background-color: var(--bg-root);
 }
 
+.quack {
+  background-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='1em' font-size='5rem'>🦆</text></svg>");
+  background-repeat: repeat;
+  background-size: 10rem;
+}
+
 body {
   display: flex;
   flex-direction: column;
diff --git a/www/layouts/404.html b/www/layouts/404.html
new file mode 100644
index 00000000..5607bd91
--- /dev/null
+++ b/www/layouts/404.html
@@ -0,0 +1,15 @@
+{{ define "headtitle" -}}
+  {{ printf "%s | %s" "404" site.Title }}
+{{- end }}
+
+{{ define "title" }}Il semblerait qu’il y ait un quack… 🦆{{ end }}
+
+{{ define "main" }}
+<p>
+  La page n’existe pas, mais vous pouvez retourner à <a href="{{ "" | relURL }}">l’accueil</a>.
+</p>
+
+<script>
+  document.documentElement.classList.add("quack");
+</script>
+{{ end }}
diff --git a/www/layouts/_default/baseof.html b/www/layouts/_default/baseof.html
index ce9613a2..6cf96b8b 100644
--- a/www/layouts/_default/baseof.html
+++ b/www/layouts/_default/baseof.html
@@ -1,17 +1,38 @@
 <!DOCTYPE html>
-<html lang="{{ or site.Language.LanguageCode site.Language.Lang }}" dir="{{ or site.Language.LanguageDirection `ltr` }}">
+<html lang="{{ or site.Language.LanguageCode site.Language.Lang }}"
+  dir="{{ or site.Language.LanguageDirection `ltr` }}">
+
 <head>
+  <title>
+    {{- block "headtitle" . -}}
+      {{- if .IsHome -}}
+        {{ site.Title }}
+      {{- else -}}
+        {{ printf "%s | %s" .Title site.Title }}
+      {{- end -}}
+    {{- end -}}
+  </title>
+
   {{ partial "head.html" . }}
 </head>
+
 <body>
   <header>
     {{ partial "header.html" . }}
+    <h1>
+      {{- block "title" . -}}
+        {{ .Title }}
+      {{- end -}}
+    </h1>
   </header>
+
   <main>
     {{ block "main" . }}{{ end }}
   </main>
+
   <footer>
     {{ partial "footer.html" . }}
   </footer>
 </body>
+
 </html>
diff --git a/www/layouts/partials/head.html b/www/layouts/partials/head.html
index 86fcbbab..5f62db76 100644
--- a/www/layouts/partials/head.html
+++ b/www/layouts/partials/head.html
@@ -1,6 +1,5 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width">
-<title>{{ if .IsHome }}{{ site.Title }}{{ else }}{{ printf "%s | %s" .Title site.Title }}{{ end }}</title>
 <meta name="description" content="{{ .Site.Params.description }}">
 <meta name="theme-color" media="(prefers-color-scheme: dark)"  content="#1a1a1f" />
 <meta name="theme-color" media="(prefers-color-scheme: light)" content="#f8f8f8" />
diff --git a/www/layouts/partials/header.html b/www/layouts/partials/header.html
index 2813612c..078bc2da 100644
--- a/www/layouts/partials/header.html
+++ b/www/layouts/partials/header.html
@@ -14,5 +14,3 @@
 </nav>
 
 {{ partial "menu.html" (dict "menuID" "main" "page" .) }}
-
-<h1>{{ .Title }}</h1>
