gistfile1.scss

.ground-button {
  @extend .button.secondary;
  @include ground-border;
  
  &:hover {
    background-color: adjust-color($ground-primary-color, $lightness: -15%)
  }
  &:focus {
      background-color: adjust-color($ground-primary-color, $lightness: -25%)
  }
  &:active {
      background-color: adjust-color($ground-primary-color, $lightness: -25%)
  }
}