Hello Donald,
Thank you for logging this feature request. Providing developers with the opportunity to apply custom classes to the Conversational UI messages wrapper elements would indeed represent a nice enhancement. We will track the customer demand here, and will consider including this enhancement to our roadmap in the future, based on the interest.
Meanwhile, the currently available option is to utilize the Message template, and apply the custom classes to a wrapper element within the template that holds the message content:
https://www.telerik.com/kendo-angular-ui/components/conversational-ui/message-templates/
Further adjustments may be required to address the built-in padding, for example:
https://stackblitz.com/edit/angular-prgivu?file=src%2Fapp%2Fapp.component.ts
Regards,
Dimiter Topalov
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