I also tried to access the site from my phone (without changing my IP address) and it worked perfectly fine.
yep, I tried to reaccessing again, and seems now it's working.
When it still down on my side, I notice the site responded with HTTP error 502.
502 Bad Gateway
The HyperText Transfer Protocol (HTTP) 502 Bad Gateway server error response code indicates that the server, while acting as a gateway or proxy, received an invalid response from the upstream server.
Note: A Gateway might refer to different things in networking and a 502 error is usually not something you can fix, but requires a fix by the web server or the proxies you are trying to get access through.
Edit:
I didn't try on any browser but I think is there anyone of you who tried a hard refresh in your browser used? (CTRL+F5) to clear the cache.
The problem does occur again to me when using a different browser. Tried hard-refreshing but no luck, but if open it on incognito mode or deleting all the browser data first, its working fine.