How to remove circle on background of checkbox?

I am trying to show a check-box in a popup screen. Actually my checkbox is rounded. I need no rounded background and tick should be green as show in image. I need checkbox will be placed on right side and having no background but have green color.

Here is my plunker: http://plnkr.co/edit/cBR2AcneBvbUCvHqwHIh?p=preview please click on the button to check checkbox .

  <ion-popover-view>
    <ion-header-bar>
      <h1 class="title">My Popover Title</h1>
    </ion-header-bar>
<ion-content><ul class="list" ng-repeat="item in a">
<li class="item item-checkbox"><label class="checkbox">
<input type="checkbox" ></label>{{item.name}}</li>
</ul>
</ion-content>
  </ion-popover-view>

I need it like this: