css 實現輸入框後加單位

<div class="row form-group">
  <div class="col-md-2">
    <label  class="form-text text-right">當前應收款</label>
  </div>
  <div class="col-md-4 form-inline">
    <div class="input-group">
      <input type="number" class="form-control"  name="totalmoney">
      <span class="input-group-addon">萬元</span>
    </div>
  </div>

</div>