Update blog.html

Author: RealMathModel

blog.html

@@ -7,6 +7,14 @@
 <meta name="apple-mobile-web-app-capable" content="yes">
 <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
 <meta name="apple-mobile-web-app-title" content="Blog">
+  <meta http-equiv="Content-Security-Policy" content="
+  default-src 'self';
+  script-src 'self' 'unsafe-inline' https://cdn.jsdelivr.net https://cdnjs.cloudflare.com;
+  style-src  'self' 'unsafe-inline' https://cdnjs.cloudflare.com;
+  font-src   'self' https://cdnjs.cloudflare.com data:;
+  img-src    'self' data:;
+  connect-src 'self';
+">
 <title>RealMathModel — Blog</title>
 
 <!-- FontAwesome -->