ant-design/style/components/treeSelect.less

@select-tree-prefix-cls: ant-select-tree;
@import "../mixins/iconfont";

.antCheckboxFn(@checkbox-prefix-cls: ant-select-tree-checkbox);

.@{select-tree-prefix-cls} {
  margin: 0;
  padding: 8px;
  font-size: 12px;
  li {
    padding: 0;
    margin: 8px 0;
    list-style: none;
    white-space: nowrap;
    outline: 0;
    &.filter-node {
      > a {
        color: @error-color!important;
        font-weight: bold!important;
      }
    }
    ul {
      margin: 0;
      padding: 0 0 0 18px;
    }
    a {
      display: inline-block;
      padding: 1px 5px;
      border-radius: 2px;
      margin: 0;
      cursor: pointer;
      text-decoration: none;
      vertical-align: top;
      color: #666;
      transition: all 0.3s ease;
      &:hover {
        background-color: tint(@primary-color, 90%);
      }
      &.@{select-tree-prefix-cls}-node-selected {
        background-color: tint(@primary-color, 80%);
      }
    }
    span {
      &.@{select-tree-prefix-cls}-checkbox {
        margin: 2px 4px 0 0;
      }
      &.@{select-tree-prefix-cls}-switcher,
      &.@{select-tree-prefix-cls}-iconEle {
        margin: 0;
        width: 16px;
        height: 16px;
        line-height: 16px;
        display: inline-block;
        vertical-align: middle;
        border: 0 none;
        cursor: pointer;
        outline: none;
      }
      &.@{select-tree-prefix-cls}-icon_loading {
        &:after {
          content: '\e6a1';
          display: inline-block;
          font-family: 'anticon';
          font-weight: bold;
          .animation(loadingCircle 1s infinite linear);
          margin-top: 8px;
        }
      }
      &.@{select-tree-prefix-cls}-switcher {
        &.@{select-tree-prefix-cls}-roots_open,
        &.@{select-tree-prefix-cls}-center_open,
        &.@{select-tree-prefix-cls}-bottom_open,
        &.@{select-tree-prefix-cls}-noline_open {
          .antTreeSwitcherIcon();
        }
        &.@{select-tree-prefix-cls}-roots_close,
        &.@{select-tree-prefix-cls}-center_close,
        &.@{select-tree-prefix-cls}-bottom_close,
        &.@{select-tree-prefix-cls}-noline_close {
          .antTreeSwitcherIcon();
          .ie-rotate(3);
          &:after {
            transform: rotate(270deg) scale(0.5);
          }
        }
      }
    }
  }
  &-child-tree {
    display: none;
    &-open {
      display: block;
    }
  }
  &-treenode-disabled {
    >span,
    >a,
    >a span {
      color: #ccc;
      cursor: not-allowed;
    }
  }
  &-icon__open {
    margin-right: 2px;
    vertical-align: top;
  }
  &-icon__close {
    margin-right: 2px;
    vertical-align: top;
  }
}