When the chatbot is in fullscreen/standalone display mode and the viewport is wide enough (~1024px or greater), the contents of the chat and the message bar itself should not exceed a certain width. This is to maintain the readability of the content at larger displays.

Set a max of 960px (60rem) to the chat container and the footer/message bar. Allow them to be centered horizontally when the viewport continues to grow wider.

Please take a look at the design specs for reference.