I would stay away from this casino, or examined them more.
It uses same template that was used previously used by some scam gambling websites.
I don't know if LionSlots777 is a scam, but using the same template is red flag for me, so think about it before sending them any coins.
Same template is used by Cryptolottery.BET so stay away from that also.
The GUI of the site is very bad and it looks like they just installed a wordpress theme and trying to manage the site it looks like their a scam but since I don't have enough evidence I won't consider it a scam yet but I will look into it further. So more research should be done on it .