The suggestion has already been made, but I want to mock-up how easy it would be to add border styles via the Domo interface. This could be on mega tables, html tables, or simple table.
We need some way to darken and thicken borders. Telling us to use bricks or something is like suggesting we go to some other application. This should be a standard ability in any reporting dashboard tool.
You could also separate border top/right/bottom/left, line color, and line thickness as different dropdowns.