ant-design/components/badge/style/ribbon.less

@import '../../style/themes/index';
@import '../../style/mixins/index';

@ribbon-prefix-cls: ~'@{ant-prefix}-ribbon';
@ribbon-wrapper-prefix-cls: ~'@{ant-prefix}-ribbon-wrapper';

.@{ribbon-wrapper-prefix-cls} {
  position: relative;
}

.@{ribbon-prefix-cls} {
  .reset-component;

  position: absolute;
  top: 8px;
  height: 22px;
  padding: 0 8px;
  color: @badge-text-color;
  line-height: 22px;
  white-space: nowrap;
  background-color: @primary-color;
  border-radius: @border-radius-sm;

  &-text {
    color: @white;
  }

  &-corner {
    position: absolute;
    top: 100%;
    width: 8px;
    height: 8px;
    color: currentColor;
    border: 4px solid;
    transform: scaleY(0.75);
    transform-origin: top;
    // If not support IE 11, use filter: brightness(75%) instead
    &::after {
      position: absolute;
      top: -4px;
      left: -4px;
      width: inherit;
      height: inherit;
      color: rgba(0, 0, 0, 0.25);
      border: inherit;
      content: '';
    }
  }

  // colors
  // mixin to iterate over colors and create CSS class for each one
  .make-color-classes(@i: length(@preset-colors)) when (@i > 0) {
    .make-color-classes(@i - 1);
    @color: extract(@preset-colors, @i);
    @darkColor: '@{color}-6';
    &-color-@{color} {
      color: @@darkColor;
      background: @@darkColor;
    }
  }
  .make-color-classes();

  // placement
  &.@{ribbon-prefix-cls}-placement-end {
    right: -8px;
    border-bottom-right-radius: 0;
    .@{ribbon-prefix-cls}-corner {
      right: 0;
      border-color: currentColor transparent transparent currentColor;
    }
  }

  &.@{ribbon-prefix-cls}-placement-start {
    left: -8px;
    border-bottom-left-radius: 0;
    .@{ribbon-prefix-cls}-corner {
      left: 0;
      border-color: currentColor currentColor transparent transparent;
    }
  }
}