That's a lot of coins and yes they're indeed offline i'm getting the same message from cloudflare including the retry for a live version beside it . Just wait it out i'm sure they're aware about their site being down and doing what they can to fix problem.
when i am trying to log in they are either way giving no page found or a pop up, wrong password or username, when i am trying to click on forgot password to reset it , the page is not opening.
It won't really work because their website is down at the moment and according to the message that you shared what you're seeing is only a snapshot of their homepage. Who knows maybe they're doing some updates.
This page (
https://www.betcoin.ag/) is currently offline.
However, because the site uses Cloudflare's Always Online technology you can continue to surf a snapshot of the site. We will keep checking in the background and, as soon as the site comes back, you will automatically be served the live version. Always Online is powered by Cloudflare | Hide this Alert