
    <div class="scrollable-container" #target>
      <div class="background">
        <nz-affix [nzTarget]="target" id="affix-container-target">
          <button nz-button [nzType]="'primary'">
            <span>Fixed at the top of container</span>
          </button>
        </nz-affix>
      </div>
    </div>
  