flex-column-reverse

bootstrap5.css

bootstrap5.css
.flex-column-reverse {
  -ms-flex-direction: column-reverse !important;
  flex-direction: column-reverse !important;
}

html bootstrap5 Sample

flexコンテナー内のアイテムの配置/下から上：flex-column-reverse

flex文字01
flex文字02
flex文字03
  <div class="d-flex flex-column-reverse">
    <div>flex文字01</div>
    <div>flex文字02</div>
    <div>flex文字03</div>
  </div>