Add theme

release-notes/v1_65.md

@@ -142,6 +142,8 @@ The run button and cell toolbar will now stick to the top of the screen when scr
 
 ![notebook cell button and toolbar scrolling](images/1_65/sticky-scroll.gif)
 
+_Theme: [Dracula](https://marketplace.visualstudio.com/items?itemName=dracula-theme.theme-dracula)_
+
 ## Extension authoring
 
 ### Language status items