diff --git a/headers/production b/headers/production
index 97a2066..521210b 100644
--- a/headers/production
+++ b/headers/production
@@ -12,4 +12,13 @@
   # content security policy
   # style-src 'unsafe-inline': syntax highlighting in codefences
   # sandbox allow-popups: enable target="_blank" links to open in new tabs
-  Content-Security-Policy: default-src 'none';
+  Content-Security-Policy: default-src 'none'
+  Content-Security-Policy: img-src 'self' https://mat.services https://stats.mat.services
+  Content-Security-Policy: style-src 'self' https://mat.services 'unsafe-inline'
+  Content-Security-Policy: font-src 'self' https://mat.services
+  Content-Security-Policy: script-src 'self' https://mat.services https://stats.mat.services
+  Content-Security-Policy: form-action 'none'
+  Content-Security-Policy: frame-ancestors 'none'
+  Content-Security-Policy: base-uri 'none'
+  Content-Security-Policy: upgrade-insecure-requests
+  Content-Security-Policy: sandbox allow-same-origin allow-scripts allow-popups allow-popups-to-escape-sandbox