border-white

bootstrap4.css

bootstrap4.css
.border-white {
  border-color: #fff !important;
}

html Sample

ボーダー色を設定する:border-*


border-primary border-secondary border-success border-danger border-warning border-info border-light border-dark border-white
  <span class="border border-primary">border-primary</span>
  <span class="border border-secondary">border-secondary</span>
  <span class="border border-success">border-success</span>
  <span class="border border-danger">border-danger</span>
  <span class="border border-warning">border-warning</span>
  <span class="border border-info">border-info</span>
  <span class="border border-light">border-light</span>
  <span class="border border-dark">border-dark</span>
  <span class="border border-white">border-white</span>