css/modules/primer-marketing-buttons/lib/button.scss

.btn-orange { @include btn-solid($white, lighten($orange-500, 7.5%), darken($orange-500, 7.5%)); }

.btn-outline-purple { @include btn-outline($purple); }
.btn-outline-orange { @include btn-outline($orange); }
.btn-outline-green { @include btn-outline($green); }

@mixin btn-transparent-active {
  color: $gray-800;
  background-color: $white;
  background-image: none;
  border-color: $white;
}

.btn-transparent {
  color: $white;
  background-color: transparent;
  background-image: none;
  border: $border-width $border-style $white-fade-50;

  &:hover,
  &:active {
    @include btn-transparent-active;
  }
}