ng-zorro-antd/tabs/style/patch.less

An enterprise-class UI components based on Ant Design and Angular

a[nz-tab-link] {
  &::before {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: transparent;
    content: '';
  }
}

nz-tabset,
nz-tabs-nav {
  display: block;
}