Add infopanel class to safe list

The .closed class that the infopanel uses was getting purged when
pushing to production. Updated the safelist to prevent this.

tailwind.config.js

@@ -11,6 +11,7 @@ module.exports = {
       '.modal-title',
       '.modal-closer',
       '.modal-body',
+      ".closed"
     ]
   },
   darkMode: false, // or 'media' or 'class'