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@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;
  }
}