// button variant
// -----------------------------------------------------------------------------
@mixin box-variant($text-color, $border-color, $background-color) {
  .c-box__header {
    color: $text-color;
    background-color: $background-color;
    border-color: $border-color;
  }
  .c-box__body {
    border-color: $border-color;
  }
}

// button variant
// -----------------------------------------------------------------------------
@mixin box-variant($text-color, $border-color, $background-color) {
  .c-box__heading {
    color: $text-color;
    background-color: $background-color;
    border-color: $border-color;
  }
  .c-box__body {
    border-color: $border-color;
  }
}

Fix Box component's variant style bug
Fix Box component's variant style bug
