text-sm-center

bootstrap5.css

bootstrap5.css
@media (min-width: 576px) {
  .text-sm-left {
    text-align: left !important;
  }
  .text-sm-right {
    text-align: right !important;
  }
  .text-sm-center {
    text-align: center !important;
  }
}

html bootstrap5 Sample

ナビゲーション：flex

  <nav class="nav nav-pills flex-column flex-sm-row">
    <a class="flex-sm-fill text-sm-center nav-link active" href="#">アクティブ</a>
    <a class="flex-sm-fill text-sm-center nav-link" href="#">リンク</a>
    <a class="flex-sm-fill text-sm-center nav-link disabled" href="#">無効</a>
  </nav>