ten-design-vue/lib/theme/components/tree-select.less

ten-vue

/* dependencies tree,input,select */
@import "../vars.less";

.ten-tree-select {
  &__tree {
    max-height: 400px;
    overflow-y: auto;
  }
}

.ten-tree-select__popup {
  &.ten-popup {
    padding: 0;
  }

  .ten-tree-select__empty {
    text-align: center;
    color: @text-color-lighter-2;
    line-height: 48px;
  }
}