-group">
            <label class="col-form-label col-form-label-sm" for="inputSmall">小さい入力欄</label>
            <input class="form-control form-control-sm" type="text" placeholder=".form-control-sm" id="inputSmall">
          </div>

          <div class="form-group">
            <label class="control-label">Input addons</label>
            <div class="form-group">
              <div class="input-group mb-3">
                <div class="input-group-prepend">
                  <span class="input