With me, the forum works without any problems, and I check Cloudflare status page which say
"No incidents reported today.". The problem seems to be only on your side, which used to happen before. You can try to restart your modem, clear DNS cache, and also browser cookies/cache.
Cloudflare has announced the maintenance for Apr 21, 21:00-22:00 UTC, so there may be minor problems that day.
Cloudflare is performing maintenance on Tuesday 21st April 2020 for a 60 minute window from 21:00 - 22:00 UTC (14:00 - 15:00 PDT). During this window, there will be a period of up to 5 minutes where operations could fail via the Cloudflare API and Dashboard while work is being carried out on the control plane and network infrastructure.
We will post an update once the maintenance is complete.