Align ion-spinner in ion-slide-box

Hi, i have this ion-view on my application and I can’t center the ion-spinner on the screen orizontally and vertically.
Can anyone help me?
Thanks in advance.

                    <div ng-hide=" == null" class=" list card">
                        <div class="item">
                            <form-input name="callerCompany" type="text" ng-model="" label="Company"></form-input>
                            <form-input name="callerName" type="text" ng-model="" label="Name"></form-input>
                        <div class="item">
                            <form-input name="callerEmail" type="text" ng-model="" label="Email"></form-input>
                            <form-input name="callerPhone1" type="text" ng-model="" label="Phone1"></form-input>
                            <form-input name="callerPhone2" type="text" ng-model="" label="Phone2"></form-input>
                            <form-input name="callerFax" type="text" ng-model="" label="Fax"></form-input>
                        <!-- SOLO PER DEBUG
                          id={{}} nr={{}}<br>
                          index {{$index}} / length {{slides.length}}<br>