col-md-2

bootstrap5.css

bootstrap5.css
.col-1,
.col-2,
.col-3,
.col-4,
.col-5,
.col-6,
.col-7,
.col-8,
.col-9,
.col-10,
.col-11,
.col-12,
.col,
.col-auto,
.col-sm-1,
.col-sm-2,
.col-sm-3,
.col-sm-4,
.col-sm-5,
.col-sm-6,
.col-sm-7,
.col-sm-8,
.col-sm-9,
.col-sm-10,
.col-sm-11,
.col-sm-12,
.col-sm,
.col-sm-auto,
.col-md-1,
.col-md-2,
.col-md-3,
.col-md-4,
.col-md-5,
.col-md-6,
.col-md-7,
.col-md-8,
.col-md-9,
.col-md-10,
.col-md-11,
.col-md-12,
.col-md,
.col-md-auto,
.col-lg-1,
.col-lg-2,
.col-lg-3,
.col-lg-4,
.col-lg-5,
.col-lg-6,
.col-lg-7,
.col-lg-8,
.col-lg-9,
.col-lg-10,
.col-lg-11,
.col-lg-12,
.col-lg,
.col-lg-auto,
.col-xl-1,
.col-xl-2,
.col-xl-3,
.col-xl-4,
.col-xl-5,
.col-xl-6,
.col-xl-7,
.col-xl-8,
.col-xl-9,
.col-xl-10,
.col-xl-11,
.col-xl-12,
.col-xl,
.col-xl-auto {
  position: relative;
  width: 100%;
  padding-right: 15px;
  padding-left: 15px;
}
bootstrap5.css
@media (min-width: 768px) {
  .col-md {
    -ms-flex-preferred-size: 0;
    flex-basis: 0;
    -ms-flex-positive: 1;
    flex-grow: 1;
    max-width: 100%;
  }
  .col-md-auto {
    -ms-flex: 0 0 auto;
    flex: 0 0 auto;
    width: auto;
    max-width: 100%;
  }
  .col-md-1 {
    -ms-flex: 0 0 8.333333%;
    flex: 0 0 8.333333%;
    max-width: 8.333333%;
  }
  .col-md-2 {
    -ms-flex: 0 0 16.666667%;
    flex: 0 0 16.666667%;
    max-width: 16.666667%;
  }
  .col-md-3 {
    -ms-flex: 0 0 25%;
    flex: 0 0 25%;
    max-width: 25%;
  }
  .col-md-4 {
    -ms-flex: 0 0 33.333333%;
    flex: 0 0 33.333333%;
    max-width: 33.333333%;
  }
  .col-md-5 {
    -ms-flex: 0 0 41.666667%;
    flex: 0 0 41.666667%;
    max-width: 41.666667%;
  }
  .col-md-6 {
    -ms-flex: 0 0 50%;
    flex: 0 0 50%;
    max-width: 50%;
  }
  .col-md-7 {
    -ms-flex: 0 0 58.333333%;
    flex: 0 0 58.333333%;
    max-width: 58.333333%;
  }
  .col-md-8 {
    -ms-flex: 0 0 66.666667%;
    flex: 0 0 66.666667%;
    max-width: 66.666667%;
  }
  .col-md-9 {
    -ms-flex: 0 0 75%;
    flex: 0 0 75%;
    max-width: 75%;
  }
  .col-md-10 {
    -ms-flex: 0 0 83.333333%;
    flex: 0 0 83.333333%;
    max-width: 83.333333%;
  }
  .col-md-11 {
    -ms-flex: 0 0 91.666667%;
    flex: 0 0 91.666667%;
    max-width: 91.666667%;
  }
  .col-md-12 {
    -ms-flex: 0 0 100%;
    flex: 0 0 100%;
    max-width: 100%;
  }
  .order-md-first {
    -ms-flex-order: -1;
    order: -1;
  }
  .order-md-last {
    -ms-flex-order: 13;
    order: 13;
  }
  .order-md-0 {
    -ms-flex-order: 0;
    order: 0;
  }
  .order-md-1 {
    -ms-flex-order: 1;
    order: 1;
  }
  .order-md-2 {
    -ms-flex-order: 2;
    order: 2;
  }
  .order-md-3 {
    -ms-flex-order: 3;
    order: 3;
  }
  .order-md-4 {
    -ms-flex-order: 4;
    order: 4;
  }
  .order-md-5 {
    -ms-flex-order: 5;
    order: 5;
  }
  .order-md-6 {
    -ms-flex-order: 6;
    order: 6;
  }
  .order-md-7 {
    -ms-flex-order: 7;
    order: 7;
  }
  .order-md-8 {
    -ms-flex-order: 8;
    order: 8;
  }
  .order-md-9 {
    -ms-flex-order: 9;
    order: 9;
  }
  .order-md-10 {
    -ms-flex-order: 10;
    order: 10;
  }
  .order-md-11 {
    -ms-flex-order: 11;
    order: 11;
  }
  .order-md-12 {
    -ms-flex-order: 12;
    order: 12;
  }
  .offset-md-0 {
    margin-left: 0;
  }
  .offset-md-1 {
    margin-left: 8.333333%;
  }
  .offset-md-2 {
    margin-left: 16.666667%;
  }
  .offset-md-3 {
    margin-left: 25%;
  }
  .offset-md-4 {
    margin-left: 33.333333%;
  }
  .offset-md-5 {
    margin-left: 41.666667%;
  }
  .offset-md-6 {
    margin-left: 50%;
  }
  .offset-md-7 {
    margin-left: 58.333333%;
  }
  .offset-md-8 {
    margin-left: 66.666667%;
  }
  .offset-md-9 {
    margin-left: 75%;
  }
  .offset-md-10 {
    margin-left: 83.333333%;
  }
  .offset-md-11 {
    margin-left: 91.666667%;
  }
}

html bootstrap5 Sample

コンパクトなカラム間隔のフォーム：form-rowとform-groupとcol-md-6

  <form>
    <div class="form-row">
      <div class="form-group col-md-6">
        <label for="inputEmail">メールアドレス</label>
        <input type="email" class="form-control" id="inputEmail" placeholder="メールアドレスを入力">
      </div>
      <div class="form-group col-md-6">
        <label for="inputPassword">パスワード</label>
        <input type="password" class="form-control" id="inputPassword" placeholder="パスワードを入力">
      </div>
    </div>
    <div class="form-row">
      <div class="form-group col-md-4">
        <label for="inputState">国</label>
        <select id="inputState" class="form-control">
          <option selected>Choose...</option>
          <option>...</option>
        </select>
      </div>
      <div class="form-group col-md-2">
        <label for="inputZip">郵便番号</label>
        <input type="text" class="form-control" id="inputZip">
      </div>
      <div class="form-group col-md-6">
        <label for="inputCity">都道府県</label>
        <input type="text" class="form-control" id="inputCity">
      </div>
    </div>
    <div class="form-group">
      <label for="inputAddress1">住所1</label>
      <input type="text" class="form-control" id="inputAddress1" placeholder="市町村">
    </div>
    <div class="form-group">
      <label for="inputAddress2">住所2</label>
      <input type="text" class="form-control" id="inputAddress2" placeholder="マンション名">
    </div>
    <div class="form-group">
      <div class="form-check">
        <input class="form-check-input" type="checkbox" id="check">
        <label class="form-check-label" for="check">チェックする</label>
      </div>
    </div>
    <button type="submit" class="btn btn-primary">サインイン</button>
  </form>

グリッドレイアウトを使用したモーダル：rowとcol

  <div class="container">
    <button type="button" class="btn btn-secondary" data-toggle="modal" data-target="#exampleModal">モーダルボタン</button>
    <div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel"
      aria-hidden="true">
      <div class="modal-dialog modal-dialog-centered" role="document">
        <div class="modal-content">
          <div class="modal-header">
            <h5 class="modal-title" id="exampleModalLabel">モーダルのタイトル</h5>
            <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span
                aria-hidden="true">×</span></button>
          </div>
          <div class="modal-body">
            <div class="container-fluid">
              <div class="row">
                <div class="col-md-4">col-md-4</div>
                <div class="col-md-4 ml-auto">col-md-4、ml-auto</div>
              </div>
              <div class="row">
                <div class="col-md-3 ml-auto">col-md-3、ml-auto</div>
                <div class="col-md-2 ml-auto">col-md-2、ml-auto</div>
              </div>
            </div>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-secondary" data-dismiss="modal">閉じる</button>
          </div>
        </div>
      </div>
    </div>
  </div>