As said by SaptakS, I applied the word-break to the message-Class. Since this breaks the line for long words without Spaces, as well as longer sentences, this is the better solution.
Since the max-width now is redundant, it got removed again, as to not cause any future confusion.
Too long single-line messages can cause the ChatUser-Panel to disappear.
Allowing the windows of the Chat to be only 80% of width will cause a automatic linebreak in such a case.
SocketIO uses the last successful method of transport to communicate. But we
have eventlet in our dependency which allows for websocket, and we ideally
want communications to be over websocket. So specified the transport method
as websocket in socket io connect.