col-sm-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: 576px) {
  .col-sm {
    -ms-flex-preferred-size: 0;
    flex-basis: 0;
    -ms-flex-positive: 1;
    flex-grow: 1;
    max-width: 100%;
  }
  .col-sm-auto {
    -ms-flex: 0 0 auto;
    flex: 0 0 auto;
    width: auto;
    max-width: 100%;
  }
  .col-sm-1 {
    -ms-flex: 0 0 8.333333%;
    flex: 0 0 8.333333%;
    max-width: 8.333333%;
  }
  .col-sm-2 {
    -ms-flex: 0 0 16.666667%;
    flex: 0 0 16.666667%;
    max-width: 16.666667%;
  }
  .col-sm-3 {
    -ms-flex: 0 0 25%;
    flex: 0 0 25%;
    max-width: 25%;
  }
  .col-sm-4 {
    -ms-flex: 0 0 33.333333%;
    flex: 0 0 33.333333%;
    max-width: 33.333333%;
  }
  .col-sm-5 {
    -ms-flex: 0 0 41.666667%;
    flex: 0 0 41.666667%;
    max-width: 41.666667%;
  }
  .col-sm-6 {
    -ms-flex: 0 0 50%;
    flex: 0 0 50%;
    max-width: 50%;
  }
  .col-sm-7 {
    -ms-flex: 0 0 58.333333%;
    flex: 0 0 58.333333%;
    max-width: 58.333333%;
  }
  .col-sm-8 {
    -ms-flex: 0 0 66.666667%;
    flex: 0 0 66.666667%;
    max-width: 66.666667%;
  }
  .col-sm-9 {
    -ms-flex: 0 0 75%;
    flex: 0 0 75%;
    max-width: 75%;
  }
  .col-sm-10 {
    -ms-flex: 0 0 83.333333%;
    flex: 0 0 83.333333%;
    max-width: 83.333333%;
  }
  .col-sm-11 {
    -ms-flex: 0 0 91.666667%;
    flex: 0 0 91.666667%;
    max-width: 91.666667%;
  }
  .col-sm-12 {
    -ms-flex: 0 0 100%;
    flex: 0 0 100%;
    max-width: 100%;
  }
  .order-sm-first {
    -ms-flex-order: -1;
    order: -1;
  }
  .order-sm-last {
    -ms-flex-order: 13;
    order: 13;
  }
  .order-sm-0 {
    -ms-flex-order: 0;
    order: 0;
  }
  .order-sm-1 {
    -ms-flex-order: 1;
    order: 1;
  }
  .order-sm-2 {
    -ms-flex-order: 2;
    order: 2;
  }
  .order-sm-3 {
    -ms-flex-order: 3;
    order: 3;
  }
  .order-sm-4 {
    -ms-flex-order: 4;
    order: 4;
  }
  .order-sm-5 {
    -ms-flex-order: 5;
    order: 5;
  }
  .order-sm-6 {
    -ms-flex-order: 6;
    order: 6;
  }
  .order-sm-7 {
    -ms-flex-order: 7;
    order: 7;
  }
  .order-sm-8 {
    -ms-flex-order: 8;
    order: 8;
  }
  .order-sm-9 {
    -ms-flex-order: 9;
    order: 9;
  }
  .order-sm-10 {
    -ms-flex-order: 10;
    order: 10;
  }
  .order-sm-11 {
    -ms-flex-order: 11;
    order: 11;
  }
  .order-sm-12 {
    -ms-flex-order: 12;
    order: 12;
  }
  .offset-sm-0 {
    margin-left: 0;
  }
  .offset-sm-1 {
    margin-left: 8.333333%;
  }
  .offset-sm-2 {
    margin-left: 16.666667%;
  }
  .offset-sm-3 {
    margin-left: 25%;
  }
  .offset-sm-4 {
    margin-left: 33.333333%;
  }
  .offset-sm-5 {
    margin-left: 41.666667%;
  }
  .offset-sm-6 {
    margin-left: 50%;
  }
  .offset-sm-7 {
    margin-left: 58.333333%;
  }
  .offset-sm-8 {
    margin-left: 66.666667%;
  }
  .offset-sm-9 {
    margin-left: 75%;
  }
  .offset-sm-10 {
    margin-left: 83.333333%;
  }
  .offset-sm-11 {
    margin-left: 91.666667%;
  }
}

html bootstrap5 Sample

読み取りテキストを、枠を非表示にする：form-control-plaintext

  <form>
    <div class="form-group row">
      <label for="staticEmail" class="col-sm-2 col-form-label">メールアドレス</label>
      <div class="col-sm-10">
        <!-- inputの枠を表示しない -->
        <input type="text" class="form-control-plaintext" readonly id="staticEmail" value="email@example.com">
      </div>
    </div>
    <div class="form-group row">
      <label for="inputPassword" class="col-sm-2 col-form-label">パスワード</label>
      <div class="col-sm-10">
        <!-- passwordを使うと、入力内容が*として表示される -->
        <input type="password" class="form-control" id="inputPassword" placeholder="パスワードを入力">
      </div>
    </div>
  </form>

水平配置のフォームを作成する：form-groupとrowとcol

ラジオボタン
チェックボックス
  <form>
    <div class="form-group row">
      <label for="inputEmail" class="col-sm-2 col-form-label">メールアドレス</label>
      <div class="col-sm-10">
        <input type="email" class="form-control" id="inputEmail" placeholder="メールアドレスを入力">
      </div>
    </div>
    <div class="form-group row">
      <label for="inputPassword" class="col-sm-2 col-form-label">パスワード</label>
      <div class="col-sm-10">
        <input type="password" class="form-control" id="inputPassword" placeholder="パスワードを入力">
      </div>
    </div>
    <fieldset class="form-group">
      <div class="row">
        <legend class="col-form-label col-sm-2 pt-0">ラジオボタン</legend>
        <div class="col-sm-10">
          <div class="form-check">
            <input class="form-check-input" type="radio" name="radios" id="radios1" value="option1" checked>
            <label class="form-check-label" for="radios1">
              オプション1
            </label>
          </div>
          <div class="form-check">
            <input class="form-check-input" type="radio" name="radios" id="radios2" value="option2">
            <label class="form-check-label" for="radios2">
              オプション2
            </label>
          </div>
          <div class="form-check">
            <input class="form-check-input" type="radio" name="radios" id="radios3" value="option3" disabled>
            <label class="form-check-label" for="radios3">
              オプション3（無効）
            </label>
          </div>
        </div>
      </div>
    </fieldset>
    <div class="form-group row">
      <div class="col-sm-2">チェックボックス</div>
      <div class="col-sm-10">
        <div class="form-check">
          <input class="form-check-input" type="checkbox" id="check1">
          <label class="form-check-label" for="check1">
            チェックする
          </label>
        </div>
      </div>
    </div>
    <div class="form-group row">
      <div class="col-sm-10">
        <button type="submit" class="btn btn-primary">サインイン</button>
      </div>
    </div>
  </form>