gis-bi/core/core-frontend/src/style/mixin.less

.border-bottom-tab(@width) {
  margin-left: @width;
  :deep(.ed-tabs__header::before),
  :deep(.ed-tabs__header::after) {
    content: '';
    position: absolute;
    bottom: 0;
    width: @width;
    height: 1px;
    background-color: rgba(31, 35, 41, 0.15);
  }
  :deep(.ed-tabs__header::before) {
    left: -@width;
  }

  :deep(.ed-tabs__header::after) {
    right: -@width;
  }
}