For additional information about the casino, OP is selling you check this page, very similar to what he has posted here
https://casinosbroker.com/growing-casino-website-for-sale/There will be additional costs running the site after the buyer bought the casino he will have to infuse more funds because based on that post there is no existing staff and things are running on freelancing
IT SPECIALIST:
Regarding the IT part of the website: Seller is not qualified in coding or changes in the template or website
structure. He hired an IT specialist as a freelancer when needed. He knows the website and the Seller could arrange his consultation for the 1st hour free and the following hours for a fee of $100/hour.
Unfortunately we don't have information about the name of the casino for privacy concern and since the casino is still opeational