@mixin text-contrast($n) {
  $color-brightness: round((red($n) * 299) + (green($n) * 587) + (blue($n) * 114) / 1000);
  $light-color: round((red(#ffffff) * 299) + (green(#ffffff) * 587) + (blue(#ffffff) * 114) / 1000);

  @if abs($color-brightness) < ($light-color/2){
    color: white;
  }

  @else {
    color: black;
  }
}