Simpler link color mixin

_link-color.scss

@mixin links($link: '#7ab4e5', $visited: '#7ab4e5', $hover: '#e62c25', $active: 'lighten($hover, 10%)', $focus: $hover, $transition: '.15s color ease-in-out') {
  &:link    { color: $link;    }
  &:visited { color: $visited; }
  &:hover   { color: $hover;   }
  &:active  { color: $active;  }
  &:focus   { color: $focus;   }
  @include transition($transition);
}

Usage - all arguments are optional
a { @include links(red, blue, green, yellow, purple, 1s all linear);}