Radius for boxes

[Charlielx]

Is your feature request related to a problem? Please describe.
All of my cards have rounded corners so the right angles are a bit jarring when transparency is enabled.

Describe the solution you'd like
Would love a "radius" key with a configurable value like "5px"

[mkanet]

@Charlielx thats a good idea. I think you're the second person to suggest this. I'll look into adding this as soon as I get time. I think rounded corners would look better anyway. I think it would look better with rounded corners.