.n-input-number
  display flex
  align-items center
  input
    text-align center
  .n-icon
    flex-shrink 0
  &.n-form-border-small .n-icon
    width 26px
    line-height @width
  &.n-form-border-middle .n-icon
    width 30px
    line-height @width
  &.n-form-border-large .n-icon
    width 40px
    font-size 18px
    line-height @width