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// COLOR CONTRAST FUNCTION
// http://codepen.io/bluesaunders/pen/FCLaz/
$dark-text-default: #424242 !default;
$light-text-default: #fff !default;

@function brightness($color) {
  @return ((red($color) * .299) + (green($color) * .587) + (blue($color) * .114)) / 255 * 100%;
}

@function color-contrast($color, $dark: $dark-text-default, $light: $light-text-default) {
  @if $color == null {
    @return null;
  }
  @else {
    $color-brightness: brightness($color);
    $light-text-brightness: brightness($light);
    $dark-text-brightness: brightness($dark);

    @return if(abs($color-brightness - $light-text-brightness) > abs($color-brightness - $dark-text-brightness), $light, $dark);
  }
}