@mixin border-bottom {
  content: '';
  display: block;
  left: 0px;
  right: 0px;
  bottom: 0px;
  border-bottom: solid 1px $color-N200;
  position: absolute;

  @at-root {
    .invert#{&} {
      border-bottom-color: $color-N800;
    }
  }
}