mui侧滑菜单主体部份不能上下滑动

<!-- 缩放式侧滑（类手机QQ） -->  
    <!-- 侧滑导航根容器 -->  
    <div class="mui-off-canvas-wrap mui-draggable mui-scalable">  
      <!-- 菜单容器 -->  
      <aside class="mui-off-canvas-left mui-transitioning" id="offCanvasSide">  
        <div class="mui-scroll-wrapper">  
          <div class="mui-scroll">  
            <!-- 菜单具体展示内容 -->  

          </div>  
        </div>  
      </aside>  
      <!-- 主页面容器 -->  
      <div class="mui-inner-wrap mui-transitioning">  
        <!-- 主页面标题 -->  
        <header class="mui-bar mui-bar-nav">  
          <a class="mui-icon mui-action-menu mui-icon-bars mui-pull-left" href="#offCanvasSide"></a>  
          <h1 class="mui-title">标题</h1>  
        </header>  
        <nav class="mui-bar mui-bar-tab">  
            <a class="mui-tab-item mui-active">  
                <span class="mui-icon mui-icon-home"></span>  
                <span class="mui-tab-label">首页</span>  
            </a>  
            <a class="mui-tab-item">  
                <span class="mui-icon mui-icon-phone"></span>  
                <span class="mui-tab-label">电话</span>  
            </a>  
            <a class="mui-tab-item">  
                <span class="mui-icon mui-icon-email"></span>  
                <span class="mui-tab-label">邮件</span>  
            </a>  
            <a class="mui-tab-item">  
                <span class="mui-icon mui-icon-gear"></span>  
                <span class="mui-tab-label">设置</span>  
            </a>  
        </nav>  
        <div class="mui-content mui-scroll-wrapper">  
          <div class="mui-scroll">  
            <!-- 主界面具体展示内容 -->  

          </div>  
        </div>    
        <div class="mui-off-canvas-backdrop"></div>  
      </div>  
    </div>

侧滑组件 主界面具体展示内容 不能上下滑动，有大神知道怎么解决嘛