border border-start-0

bootstrap5.css

.border-start-0 {
  border-left: 0 !important;
}

html bootstrap5 Sample

ボーダーを削除する：border-0

border-0 border-top-0 border-end-0 border-bottom-0 border-start-0

  <!-- 全ボーダー削除 -->
  <span class="border border-0">border-0</span>
  <span class="border border-top-0">border-top-0</span>
  <span class="border border-end-0">border-end-0</span>
  <span class="border border-bottom-0">border-bottom-0</span>
  <span class="border border-start-0">border-start-0</span>