SSL and template joomla

I want to ask for help or advice. I already have experience installing the SSL for the Cloudflare. Previously, to restore the template, I installed the plugin Cloudflare For Joomla, then in the file configuration.php I wrote the line $_SERVER[‘HTTPS’] = ‘on’; and the template was added. with this site https://gaudi-rielt.ru/ does not work. Help me please.

It looks like you are experiencing issues with Mixed Content on your site, which is preventing the SSL lock. Have you tried this?

https://support.cloudflare.com/hc/en-us/articles/200170476-How-do-I-fix-the-SSL-Mixed-Content-Error-Message-