How to add borders to the viz
Adding border to the visualization might not be that straight forward. This KB tends to demonstrate how to do that properly.
In order to add borders to the visualization (either stacked bar charts or other types), first you need to go to that sheet itself. It cannot be done from dashboard.
When in sheet's view, from the "Marks" card at the middle/bottom left hand side of the working space, select "Color":
Then in the little window that opens up, click the "border" input which opens the colors you can choose for your border:
