Hey Brawlers!
Unfortunately at this time the login page on bakugandimensions.com is not accessible, however the dev team has made available the following workaround URL for your convenience:
http://bakugandimensions.com/s3/dimensions/index.html
Please note that the Play Now button might not be visible, but you will still be able click the general area on the page where the Play Now button should be in order to access the game.
Thank you for your patience as the dev team is working diligently to get the login page for Dimensions completely back online.
~BrightLight and the Dimensions Team