app/node_modules/ng-zorro-antd/input-number/style/affix.less

@import '../../input/style/mixin';
@import (reference) '../../style/themes/index';
@input-prefix-cls: ~'@{ant-prefix}-input';

@input-affix-margin: 4px;

.@{ant-prefix}-input-number {
  &-affix-wrapper {
    .input();
    // or number handler will cover form status
    position: relative;
    display: inline-flex;
    width: 90px;
    padding: 0;
    padding-inline-start: @input-padding-horizontal-base;

    &:not(&-disabled):hover {
      .hover();
      z-index: 1;
    }

    &-focused,
    &:focus {
      z-index: 1;
    }

    &-disabled {
      .@{ant-prefix}-input-number[disabled] {
        background: transparent;
      }
    }

    > div.@{ant-prefix}-input-number {
      width: 100%;
      border: none;
      outline: none;

      &.@{ant-prefix}-input-number-focused {
        box-shadow: none !important;
      }
    }

    input.@{ant-prefix}-input-number-input {
      padding: 0;
    }

    &::before {
      display: inline-block;
      width: 0;
      visibility: hidden;
      content: '\a0';
    }

    .@{ant-prefix}-input-number-handler-wrap {
      z-index: 2;
    }
  }

  &-prefix,
  &-suffix {
    display: flex;
    flex: none;
    align-items: center;
    pointer-events: none;
  }

  &-prefix {
    margin-inline-end: @input-affix-margin;
  }

  &-suffix {
    position: absolute;
    top: 0;
    right: 0;
    z-index: 1;
    height: 100%;
    margin-right: @input-padding-horizontal-base;
    margin-left: @input-affix-margin;
  }
}

.@{ant-prefix}-input-number-group-wrapper .@{ant-prefix}-input-number-affix-wrapper {
  width: 100%;
}