.hairline-common() {
    content: ' ';
    position: absolute;
    pointer-events: none;
    box-sizing: border-box;
  }
  
  .hairline(@border-color: #ebedf0) {
    .hairline-common();
  
    top: -50%;
    left: -50%;
    right: -50%;
    bottom: -50%;
    transform: scale(0.5);
    border: 0 solid @border-color;
  }
  
  .hairline-bottom(@border-color: #ebedf0, @left: 0) {
    .hairline-common();
  
    left: @left;
    right: 0;
    bottom: 0;
    transform: scaleY(0.5);
    border-bottom: 1px solid @border-color;
  }