I'm using Cloudflare to speed up my website and have a free SSL certificate for my domain. Everything is fine with the page of my main domain, but today I have created a subdomain to install WordPress on it, and it turns out that after adding it in the Cloudflare DNS list, it no longer loads the styles (only the HTML is seen).
Chrome shows me in the address bar on the right an alert that says "Unsecured content blocked," and it is.
I have verified that the error can not come from using HTTPS and loading documents with HTTP, because WordPress does it well and uses //domain.com/example to load everything.
What could it be?