speech bubble tail at 45

Giganews Newsgroups
Subject: speech bubble tail at 45
Posted by:  Andrew Poulos (ap_pr…@hotmail.com)
Date: Fri, 7 Jun 2019

There are plenty of examples of speech bubbles with their tail pointing
up or down, or left or right. What I would like is a tail that points up
and to the right (at 45 degrees) from the top right corner of the speech

If this is possible with just CSS, how is it done?

Andrew Poulos