Card header/footer doesn't look nice with primary + inverse
Created by: roest01
Combine card-primary and card-inverse like written in documentation results in an unfinished view.
https://jsfiddle.net/roest/LL0qnnxm/
Also think about making the header or footer primary results in problem with card-inverse selector wich is compiled to .card-inverse .card-header therefore not a good result with card-header card-primary card-inverse
