iOS cut in half the input box

Hey There any Ideas why this happen ?

this thing happens just only on iOS

below the code:

<input type="tel" ng-blur="hideinsertWith()" style="color:{{colorsaved}}; margin-top:-5.44vh;width:80%; margin-left: 10%; font-size: 12vh; height: 12vh;" id="inputamount" class="hide" autofocus ng-change="inputValid()" ng-model="withdrawData.amount2">