为什么我的icon位置偏下
<div class="form-group has-error has-feedback">
        <lable class="control-label" for="input-email">email地址</lable>
        <input type="text" class="form-control" id="input-email" >
        <span class="glyphicon glyphicon-remove form-control-feedback"></span>
    </div>


 
                             
                            