// let's chain our @mixin linear-gradient from _mixins.scss
// and drive the colors from _colors.scss
@mixin blue-gradient {
  @include linear-gradient( top, $lightblue, $darkblue );
  &:hover { @include linear-gradient( top, lighten($lightblue, 10%), $darkblue );
  &:active { background: $darkblue; }
}