diff --git a/static/Caddyfile b/static/Caddyfile
index c485f50..19d933a 100644
--- a/static/Caddyfile
+++ b/static/Caddyfile
@@ -43,7 +43,7 @@ http://static-mat-services.fly.dev/ {
       frame-ancestors 'none';
       base-uri 'none';
       upgrade-insecure-requests;
-      sandbox allow-same-origin allow-popups"
+      sandbox allow-same-origin allow-popups-to-escape-sandbox"
   }
 
   # caching