fixed card-outline inside card wrong styling #2205

build/scss/_mixins.scss

@@ -7,7 +7,7 @@
 @mixin cards-variant($name, $color) {
   .card-#{$name} {
     &:not(.card-outline) {
-      .card-header {
+      > .card-header {
         background-color: $color;
         border-bottom: 0;