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Implement a Custom Chat Window Using Visualforce
Einstein Bots doesn’t support menus and quick replies in custom Chat windows. To learn more about Einstein Bots Chat channel specifications, see Deploy Your Bot to Channels.
Avoid linking to Salesforce CSS stylesheets when you customize your chat window. They aren’t versioned and can change without notice. Instead, we recommend that you use Visualforce components that mimic Salesforce styles instead of directly referencing the stylesheets. That way, you’re always in control of how your chat window looks. See Using Styles from Salesforce Stylesheets to lean how to disable our stylesheets.
For more information on using Visualforce, see the Visualforce Developer Guide.