ChatModule modifies the default module box for joining the chat as seen on the image in the infobox.
To install this code on your wiki just add the following @import line to your Chat.css. (Note that all imports go at the very top of the page)
The code will add a little number after the main heading which will state the number of users on the chat. Also each user's avatar will be circle-shaped, the box have different arrows and the join button will be in a slightly different position to avoid overlapping with the right arrow.