nes.css/scss/elements/lists.scss

.nes-list {
  $disc: (
    (0, 0, 0, 1, 1, 0, 0, 0),
    (0, 0, 1, 1, 1, 1, 0, 0),
    (0, 1, 1, 1, 1, 1, 1, 0),
    (0, 1, 1, 1, 1, 1, 1, 0),
    (0, 0, 1, 1, 1, 1, 0, 0),
    (0, 0, 0, 1, 1, 0, 0, 0)
  );

  $circle: (
    (0, 0, 0, 1, 1, 0, 0, 0),
    (0, 0, 1, 1, 1, 1, 0, 0),
    (0, 1, 1, 0, 0, 1, 1, 0),
    (0, 1, 1, 0, 0, 1, 1, 0),
    (0, 0, 1, 1, 1, 1, 0, 0),
    (0, 0, 0, 1, 1, 0, 0, 0)
  );
  $colors: ($base-color, map-get($default-colors, "shadow"));

  list-style-type: none;

  & li {
    position: relative;
  }

  &.is-disc li::before {
    position: absolute;
    top: calc(50% - 8px);
    left: -22px;
    content: "";

    @include pixelize($disc, $colors, 2px);
  }

  &.is-circle li::before {
    position: absolute;
    top: calc(50% - 8px);
    left: -22px;
    content: "";

    @include pixelize($circle, $colors, 2px);
  }
}