message: fix: can't custom hairline border color
diff: +@import '../var';
  +
  .hairline-common() {
  position: absolute;
  box-sizing: border-box;
  pointer-events: none;
  }
  -.hairline(@border-color: #ebedf0) {
  +.hairline(@color: @border-color) {
  .hairline-common();
  top: -50%;
  right: -50%;
  bottom: -50%;
  left: -50%;
  - border: 0 solid @border-color;
  + border: 0 solid @color;
  transform: scale(0.5);
  }
  -.hairline-bottom(@border-color: #ebedf0, @left: 0) {
  +.hairline-bottom(@color: @border-color, @left: 0) {
  .hairline-common();
  right: 0;
  bottom: 0;
  left: @left;
  - border-bottom: 1px solid @border-color;
  + border-bottom: 1px solid @color;
  transform: scaleY(0.5);
  }
  