sass-site/source/assets/css/components/_buttons.scss

.button { @extend %button; }

.primary {
  background-color: $color-primary;
  border-color: darken($color-primary, 5);

  &,
  &:visited,
  &:hover,
  &:focus,
  &:active,
  &.active { color: $color-text-strong-invert; }

  &:hover,
  &:focus,
  &:active
  &.active { background-color: darken($color-primary, 8%); }
}

%clear-button {
  @include box-shadow(none);
  border-color: transparent;
  background: none;
  color: inherit;
}