Hi @ahamann 

I have faced the same issue on my PDI.

Although I have a question. This border that you are referring to, are you not able to see when you are editing/adding content to the editor, or when the text is published.

For ex - Lets consider the case of KB creation. Are you facing the issue with border when adding content to the editor, or is the border not visible even when the article is published.

You might want to raise a Hi support case and get a confirmation from ServiceNow support if this is expected or a product bug.