diff --git a/layouts/_default/baseof.html b/layouts/_default/baseof.html
index f6bf0b5..2cc8b9b 100644
--- a/layouts/_default/baseof.html
+++ b/layouts/_default/baseof.html
@@ -2,17 +2,17 @@
 <html lang="{{ with .Site.LanguageCode }}{{ . }}{{ else }}en-US{{ end }}">
 
 <head>
-  <meta http-equiv="X-Clacks-Overhead" content="GNU Terry Pratchett" />
   <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta http-equiv="Content-Security-Policy" content="script-src 'self'">
   {{- partial "favicon.html" . -}}
   <title>{{- block "title" . }}{{ with .Title }}{{ . }}{{ end }}{{- end }}</title>
 
   {{- partial "seo_tags.html" . -}}
-  <meta name="referrer" content="no-referrer-when-downgrade" />
+  <meta name="referrer" content="no-referrer-when-downgrade">
 
   {{ with .OutputFormats.Get "rss" -}}
-  {{ printf `<link rel="%s" type="%s" href="%s" title="%s" />` .Rel .MediaType.Type .Permalink $.Site.Title | safeHTML }}
+  {{ printf `<link rel="%s" type="%s" href="%s" title="%s">` .Rel .MediaType.Type .Permalink $.Site.Title | safeHTML }}
   {{ end -}}
 
   {{- partial "style.html" . -}}
