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// Slightly lighten a color
// @access public
// @param {Color} $color - color to tint
// @param {Number} $percentage - percentage of `$color` in returned color
// @return {Color}
@function tint($color, $percentage) {
    $percentage: calc(100 - $percentage);
    @return mix(white, $color, $percentage);
}


// Usage
color: tint(#663399, 80);