ng2-datetime - 增加控件的宽度

Question

如何使日期时间字段的宽度与Angular 2中类col-sm-9的其他输入字段对齐？

<div class="form-group">
  <label class="control-label col-sm-3">What is the Expiry Date ?</label>
<div class="col-sm-9">
   <datetime [timepicker]="false" formControlName="ExpiryDate"></datetime>
 </div>
</div>

<div class="form-group">
  <label class="control-label col-sm-3">Email</label>
  <div class="col-sm-9">
    <input type="text" class="form-control" formControlName="Email">
  </div>
</div>

由于