@function light-pie-chart-theme() {
  @return pie-theme(#fff);
}

@function dark-pie-chart-theme() {
  @return pie-theme(#000);
}

@function pie-theme($donut-color) {
  @return (
    donut-color: $donut-color
  );
}

@mixin pie-chart-theme($theme) {

  #piechart .inner-circle {
    fill: map-get($theme, donut-color);
  }
}