如何在引导程序中使用边距和填充？

Question

我一直在使用bootstrap创建一个表单，但结果对我来说不合适。我怎样才能让我的表格更好？

           <div class="row" ng-if="model.FieldType == customTypes.Select">
                        <div class="form-group">
                            <label class="control-label col-md-4">Seçim</label>
                            <div class="input-group col-md-8">
                                <input type="text" class="form-control" ng-model="model.NewComboItemForSelect"/>
                                <div class="input-group-btn">
                                    <button type="button" class="btn btn-success" ng-click="AddToDropDownList()">+</button>
                                </div>
                         </div>
                        <div class="form-group">
                            <div class="col-md-8 pull-right">
                                <select class="form-control" ng-options="field.id as field.value for field in DropdownListCustomItems" ng-model="model.DropdownListCustomItem"></select>
                            </div>
                        </div>
                    </div>
                </div>