amis2/scss/components/form/_textarea.scss

.#{$ns}TextareaControl {
  @include input-text();
  --Form-input-clearBtn-padding: #{px2rem(2px)};

  position: relative;

  > textarea {
    @include input-border();

    border: 1px solid var(--Form-input-borderColor);
    border-radius: var(--Form-input-borderRadius);
    background: var(--Form-input-bg);
    padding: var(--Form-input-paddingY) var(--Form-input-paddingX);
    font-size: var(--Form-input-fontSize);
    display: block;
    width: 100%;
    line-height: var(--Form-input-lineHeight);
    outline: none;
    resize: vertical;

    &::placeholder {
      color: var(--Form-input-placeholderColor);
    }

    // yunshe4.0
    &:hover {
      border-color: var(--Form-input-onHover-borderColor);
    }
  }

  &-counter {
    position: absolute;
    right: var(--Form-input-paddingX);
    bottom: var(--Form-input-paddingY);
    font-size: var(--fontSizeSm);
    padding: 0 5px;
    border-radius: 3px;
    color: #84868c;

    &.is-empty {
      color: #84868c;
    }

    &.is-clearable {
      right: calc(
        var(--Form-input-paddingX) + var(--Form-input-clearBtn-size) +
          var(--Form-input-clearBtn-padding) * 2 + #{px2rem(5px)}
      );
    }
  }

  .has-error--maxLength &-counter {
    background: var(--danger);
  }

  &-clear {
    @include input-clear();
    position: absolute;
    right: var(--Form-input-paddingX);
    bottom: var(--Form-input-paddingY);
  }
}