 <nz-space nzDirection="vertical" style="width: 100%">
    <nz-input-number *nzSpaceItem [ngModel]="3"></nz-input-number>
    <nz-input-number *nzSpaceItem nzVariant="filled" [ngModel]="3"></nz-input-number>
    <nz-input-number *nzSpaceItem nzVariant="borderless" [ngModel]="3"></nz-input-number>
    <nz-input-number *nzSpaceItem nzVariant="underlined" [ngModel]="3"></nz-input-number>
  </nz-space>