@mixin sidebar-width($borders, $width) {
  $sidebar-width: $width;

  @each $border in $borders {
    $direction: nth($border, 1);
    @if $direction == "all" {
      $size: map-get(map-get($borders, $direction), size);
      $sidebar-width: ($sidebar-width - (2 * $size));
    } @else if $direction == "right" {
      $size: map-get(map-get($borders, $direction), size);
      $sidebar-width: $sidebar-width - $size;
    } @else if $direction == "left" {
      $size: map-get(map-get($borders, $direction), size);
      $sidebar-width: $sidebar-width - $size;
    }
    width: $sidebar-width;
  }
}