@mixin tile() {
  border-radius: $base-border-radius;
  border: $form-border-style;

  @include outer-spacing($bottom: $spacing-md);
}

@mixin tile() {
  border-radius: $base-border-radius;
  border: $base-border-style;

  @include outer-spacing($bottom: $spacing-md);
}

Fix variable reference in tile() mixin
Fix variable reference in tile() mixin
