The website is loading fine here. See yourself
The 502 error code can have several reasons and not just the server overloaded. It can be a hosting server failure, a programming problem, and even a problem from
your browser caused by an addon, or a gateway from
your network provider.
In case you want to know if you're the only one to get this error message, use a site like downforeveryoneorjustme.com. If the website says it's just you then the problem come from your side and if not then you know everybody can't open it properly