Welcome to the forums @baberbam. This is a problem that it seems many people here have had. If you search the forum for “mocha div missing” you will find many posts and many solutions. One of them is that you have to add codepen.io to the list of allowed third-party website cookies.
None of the suggested answers worked. However what did work was testing it in Chrome. We found out that Edge was failing. After updating to the new MS Edge, everything works perfectly. Thanks for the response.