.border-bottom(@b: 0, @t: inherit, @bColor: @grey-border) {
  position: relative;
  &::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 1px;
    background-color: @bColor;
    transform: scaleY(0.5);
    left: 0;
    bottom: @b;
    top: @t;
  }
}