@arco-design/web-react/lib/Trigger/style/index.less

Arco Design React UI Library.

@import './token.less';

@trigger-prefix-cls: ~'@{prefix}-trigger';

.@{trigger-prefix-cls} {
  position: absolute;
  z-index: @z-index-popup;
  backface-visibility: hidden; // Prevent shaking

  &-arrow {
    background-color: @trigger-color-arrow-bg;
    content: '';
    height: @trigger-size-arrow-width;
    width: @trigger-size-arrow-width;
    position: absolute;
    display: block;
    box-sizing: border-box;
    transform: rotate(45deg);
    transform-origin: 50% 50% 0;
    z-index: -1;
  }

  &[trigger-placement='top'] > &-arrow-container &-arrow,
  &[trigger-placement='tl'] > &-arrow-container &-arrow,
  &[trigger-placement='tr'] > &-arrow-container &-arrow {
    bottom: -(@trigger-size-arrow-width / 2);
    margin-left: -(@trigger-size-arrow-width / 2);
    border-top: none;
    border-left: none;
    border-bottom-right-radius: @trigger-border-arrow-radius;
  }

  &[trigger-placement='bottom'] > &-arrow-container &-arrow,
  &[trigger-placement='bl'] > &-arrow-container &-arrow,
  &[trigger-placement='br'] > &-arrow-container &-arrow {
    top: -(@trigger-size-arrow-width / 2);
    margin-left: -(@trigger-size-arrow-width / 2);
    border-bottom: none;
    border-right: none;
    border-top-left-radius: @trigger-border-arrow-radius;
  }

  &[trigger-placement='left'] > &-arrow-container &-arrow,
  &[trigger-placement='lt'] > &-arrow-container &-arrow,
  &[trigger-placement='lb'] > &-arrow-container &-arrow {
    right: -(@trigger-size-arrow-width / 2);
    margin-top: -(@trigger-size-arrow-width / 2);
    border-left: none;
    border-bottom: none;
    border-top-right-radius: @trigger-border-arrow-radius;
  }

  &[trigger-placement='right'] > &-arrow-container &-arrow,
  &[trigger-placement='rt'] > &-arrow-container &-arrow,
  &[trigger-placement='rb'] > &-arrow-container &-arrow {
    left: -(@trigger-size-arrow-width / 2);
    margin-top: -(@trigger-size-arrow-width / 2);
    border-top: none;
    border-right: none;
    border-bottom-left-radius: @trigger-border-arrow-radius;
  }

  &-rtl {
    direction: rtl;
  }
}