You can use the "{{% livechat_label transparent_background %}}" option to have a transparent background in OBS.If you want to customize the background transparency, you can add this CSS in your OBS browser source's settings:
Note: you can entirely customize chat colors. This is undocumented yet, but you can try this: in the modal, check «use curent theme colors», then you can try to manually change color values in the URL.You must use valid CSS color values, and they must be properly URL encoded.
You can use OBS "Custom browser docks" to integrate the chat in your OBS while you are streaming.The livechat plugin offers a way to create long term token that can identify you automatically to join the chat, so you don't have to enter your password in OBS.
To do so, just use the "{{% livechat_label share_chat_link %}}" feature, and open the "{{% livechat_label share_chat_dock %}}" tab.From there, you can create a new token using the "+" button.
Tokens are valid to join any chat room. You don't have to generate separate tokens for each of your rooms.You can also customize the nickame that will be used by changing the `n` parameter in the url.