Bootstrap这种提示框白色的背景怎么去掉

Question

<!--顶部-->
  <div class="subheader editor-toolbar clearfix" id="editor-header">
      <div class="btn-group pull-left">
        <div class="btn-toolbar pull-left" ng-controller="ToolbarController" ng-cloak>
        <span ng-repeat="item in items">
          <div style='float:left;margin-left: 10px;text-align: center;width: 30px;'>
          <button id="{{item.id}}"
                  title="{{item.name | translate}}"
                  ng-switch on="item.type"
                  class="btn btn-inverse" ng-class="{'separator': item.type == 'separator'}"
                  ng-disabled="item.type == 'separator' || item.enabled == false"
                  ng-click="toolbarButtonClicked($index)">
            <i ng-switch-when="button" ng-class="item.cssClass" class="toolbar-button" data-toggle="tooltip" data-title="{{item.name + '321'}}" bs-tooltip data-placement="bottom">
            </i>
            <div ng-switch-when="separator" ng-class="item.cssClass"></div>
          </button>
            <!-- <button class="btn-text">{{item.name}}</button> -->
    </div></span>&nbsp;
    <span>
      <button title="还原" class="btn btn-inverse" ng-click="reLoad()" data-title="还原" data-html="true"  bs-tooltip data-placement="bottom">
        <span class='glyphicon glyphicon-refresh' style="color: #fff;"></span>
        还原
        </button>
    </span>
    <span ng-show='items.length>0'>
      <button title="全局设置" data-title="全局设置" data-html="true"  bs-tooltip data-placement="bottom"  ng-disabled='selectedItem.properties[0].key!="oryx-process_id"'  class="btn btn-inverse" ng-class="{'separator1': selectedItem.properties[0].key=='oryx-process_id'}"  ng-click='global()'><span class='glyphicon glyphicon-cog' style="color: #fff;"></span> 全局设置</button>
    </span>

            </div>
        </div>
        <div class="btn-group pull-right" ng-show="!secondaryItems.length">
            <div class="btn-toolbar pull-right" ng-controller="ToolbarController">
            <button  ng-repeat="item in secondaryItems" ng-switch on="item.type" class="btn btn-inverse" ng-class="{'separator': item.type == 'separator'}"
                ng-disabled="item.type == 'separator'" ng-click="toolbarSecondaryButtonClicked($index)" id="{{item.id}}">
                <i ng-switch-when="button" ng-class="item.cssClass" class="toolbar-button" data-title="{{item.name | translate}}" data-html="true"  bs-tooltip data-placement="bottom"></i>
                <div ng-switch-when="separator" ng-class="item.cssClass"></div>
            </button>
            </div>
        </div>
  </div>