amis2/packages/amis-editor-core/scss/_classname-picker.scss

.ae-ClassNamePicker-popover {
  padding: 10px;
  width: 610px;
  max-height: min(calc(100% - 220px), 400px);
  min-height: 220px;
  overflow: auto;

  &.ae-PopOver--leftBottomLeftTop {
    margin-top: 1px;
  }

  &.ae-PopOver--leftTopLeftBottom {
    margin-top: -1px;
  }
}

.ae-ClassNameControl-group {
  margin: 10px;
  display: inline-block;
  width: 265px;

  &.w2x {
    width: 550px;
  }

  .ae-ClassNameControl-group {
    padding-left: 65px;
    margin: 0;
    display: block;
    width: auto;

    &:not(:last-child) {
      margin: 0 0 10px 0;
    }

    .ae-ClassNameControl-groupLabel {
      float: left;
      border: none;
      padding-top: 5px;
      padding-bottom: 0;
      text-align: right;
      margin: 0 0 0 -60px;
      font-size: 12px;
    }
  }

  .ae-ButtonGroup + .ae-ButtonGroup {
    margin-left: 5px;
  }
}

.ae-ClassNameControl-groupLabel {
  border-bottom: px2rem(1px) solid lighten($color: $borderColor, $amount: 5%);
  display: block;
  padding-bottom: 5px;
  margin-bottom: 10px;
  font-size: 14px;
}