I want to change the width of the web-embedded chat window to 600px

I want to change the width of my web-embedded chat window to 600px.
I know how to use custom CSS, but I don’t know which CSS class name to use to change the size of the chat window.

Does anyone know?


I added the following code to my custom CSS.
The width of the chat window is now 600px.

.bpw-layout {
width: 600px !important;

By the way, 600px did not display the text properly, so I set mine to 470px.