.usa-section–dark {

@if variable-exists(alt-section-bg) {
  background-color: color($alt-section-bg);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  @if variable-exists(alt-section-header) {
    color: color($alt-section-header);
  }
}

p {
  @if variable-exists(alt-section-text) {
    color: color($alt-section-text);
  }
}

a {
  @if variable-exists(alt-section-link) {
    color: color($alt-section-link);
  }

  &:hover {
    @if variable-exists(alt-section-link-hover) {
      color: color($alt-section-link-hover);
    }
  }
}

}